This mitzvah changes the way a person sees the world. Life can feel scattered. A person faces work, family, pressure, success, fear, health, money, and responsibility. יִחוּד ה׳ — the unity of Hashem teaches that all of it stands under one Divine rule.

Saying Shema each day trains the mind and heart to return to the center. A Jew begins and ends the day by declaring that Hashem is One. This gives life direction. It reminds him that nothing is random, no power is independent, and no part of life is outside Hashem’s presence.

This mitzvah also protects a person from spiritual confusion. Many things can feel powerful: money, people, fear, politics, nature, success, or failure. The mitzvah teaches that none of them is ultimate. Hashem alone rules.

Living with this mitzvah means trying to see Hashem in every area of life. Prayer, business, learning, home, challenges, and joy all become parts of one avodah — service of Hashem. A Jew does not live in separate worlds. He lives before the One Hashem.

Rambam

• Source: Rambam, Sefer HaMitzvos, Positive Mitzvah 2; Mishneh Torah, Hilchos Yesodei HaTorah 1:7.
• Rambam defines this mitzvah as the command to know that Hashem is One. He explains that Hashem’s unity is not like the unity of a physical object or a group made of parts. Hashem is absolutely One, with no division, body, form, or composition. This mitzvah gives Jewish belief its clear foundation.

Sefer HaChinuch

• Source: Sefer HaChinuch, Mitzvah 417.
• Sefer HaChinuch explains that the root of this mitzvah is to place in the heart the truth that Hashem alone rules all existence. This belief protects a person from idolatry and false powers. When a person knows that Hashem is One, his mind and life become directed toward the true Source of everything.

Gemara

• Source: Gemara Berachos 13b.
• The Gemara teaches that a person must have kavvanah — focused intention when saying the first pasuk of Shema. This shows that יִחוּד ה׳ — the unity of Hashem is not a line to recite without thought. It must be accepted with the mind and heart.

Gemara

• Source: Gemara Berachos 61b.
• The Gemara describes Rabbi Akiva accepting the yoke of Heaven while saying Shema, even at the moment of death. This shows the power of יִחוּד ה׳ — the unity of Hashem. Shema is not only a daily declaration. It is the deepest commitment of Jewish life.

Gemara

• Source: Gemara Pesachim 50a.
• The Gemara teaches that in the future, Hashem’s Name will be fully recognized as One. In this world, people experience blessing and hardship differently, but in the future the unity of Hashem’s rule will be revealed clearly. This deepens the mitzvah by showing that our present faith will one day become open knowledge.

Sifrei

• Source: Sifrei, Va’eschanan 31.
• Sifrei expounds Shema as the declaration that Hashem, who is now recognized by Israel, will one day be recognized by all humanity. This teaches that יִחוּד ה׳ — the unity of Hashem is both a personal mitzvah and the final truth of history.

Devarim Rabbah

• Source: Devarim Rabbah 2:31.
• The Midrash teaches that Shema is the great testimony of Israel’s faith. Klal Yisrael declares Hashem’s unity in a world filled with confusion and false powers. The mitzvah makes Israel witnesses to the truth of Hashem.

Midrash Tanchuma

• Source: Midrash Tanchuma, Va’eschanan 6.
• Tanchuma presents Shema as the center of Israel’s acceptance of Hashem’s kingship. The mitzvah teaches that knowing Hashem is One must lead to loyalty, obedience, and love. Unity is not only belief. It becomes allegiance.

Rashi

• Source: Rashi on Devarim 6:4.
• Rashi explains that Hashem, who is now our G-d and not openly accepted by all nations, will one day be recognized as One by the whole world. His reading shows that Shema looks toward the final revelation of Hashem’s unity.

Ramban

• Source: Ramban on Devarim 6:4.
• Ramban explains that Shema commands Israel to accept the truth of Hashem’s unity and rule. This belief stands against every form of idolatry and divided power. The mitzvah teaches that all strength, life, and authority come from Hashem alone.

Ibn Ezra

• Source: Ibn Ezra on Devarim 6:4.
• Ibn Ezra explains the pasuk as a declaration that Hashem alone is G-d and that His unity is complete. His reading highlights the simple force of the verse. Israel must know that there is no other independent power beside Him.

Sforno

• Source: Sforno on Devarim 6:4.
• Sforno explains that Hashem is One in a way that no created thing can be one. Created things are made of parts or limits. Hashem’s unity is absolute. The mitzvah therefore lifts the mind beyond physical examples of oneness.

Abarbanel

• Source: Abarbanel on Devarim 6.
• Abarbanel explains Shema as the central declaration of Jewish belief. It rejects the idea of many forces and establishes Hashem as the One ruler of heaven and earth. Through this mitzvah, Israel carries the pure faith of Torah.

Rabbeinu Bachya

• Source: Rabbeinu Bachya on Devarim 6:4.
• Rabbeinu Bachya teaches that the word אֶחָד — One points to Hashem’s complete unity and His rule over all directions and all existence. When a person says Shema, he should think that Hashem’s kingship fills heaven, earth, and every part of reality.

Chizkuni

• Source: Chizkuni on Devarim 6:4.
• Chizkuni explains that Shema teaches Israel to know Hashem as the One G-d. The mitzvah stands as the foundation for the commands that follow, especially love of Hashem and constant Torah life. Belief in unity becomes the root of service.

Kuzari

• Source: Kuzari 1:25.
• The Kuzari teaches that Israel’s knowledge of Hashem begins from revelation and national experience, not abstract guessing. The mitzvah of יִחוּד ה׳ — the unity of Hashem is therefore rooted in what Israel heard, saw, and received. Shema is the living testimony of that received faith.

Maharal

• Source: Maharal, Tiferes Yisrael, Chapter 37.
• Maharal explains that true unity belongs only to Hashem, because everything created is limited and divided. Hashem is beyond division and beyond comparison. Knowing His unity means recognizing that all existence receives its order from Him.

Ran

• Source: Derashos HaRan, Derush 9.
• Ran explains that faith in Hashem’s unity gives structure to all Torah belief. If there is one Creator and one ruler, then Torah has one Divine source and one binding authority. The mitzvah creates the foundation for accepting mitzvos as Hashem’s will.

Ritva

• Source: Ritva on Berachos 13b.
• Ritva explains the need for kavvanah — focused intention in the first pasuk of Shema because this is the main acceptance of Hashem’s unity and kingship. The mitzvah is fulfilled through conscious recognition, not only sound.

Rashba

• Source: Rashba, Teshuvos 5:55.
• Rashba explains that Hashem’s unity cannot be understood like physical unity. Hashem has no body, division, or parts. His unity is simple, absolute, and beyond created categories. This protects the mitzvah from shallow or physical misunderstanding.

Shulchan Aruch

• Source: Shulchan Aruch, Orach Chaim 60:5.
• Shulchan Aruch rules that mitzvos require kavvanah — intention, and this is especially important in Shema. A person must know that he is fulfilling Hashem’s command when accepting His unity.

Shulchan Aruch

• Source: Shulchan Aruch, Orach Chaim 61:4–6.
• Shulchan Aruch rules that one must concentrate deeply on the first pasuk of Shema, especially the word אֶחָד — One. This is the practical expression of the mitzvah. The mouth says the words, and the mind accepts Hashem’s unity.

Rema

• Source: Rema, Orach Chaim 61:6.
• Rema records the practice to extend the dalet of אֶחָד — One enough to think that Hashem rules above, below, and in all four directions. This practice gives the mitzvah a clear mental form. The person thinks about Hashem’s rule over all reality.

Mishnah Berurah

• Source: Mishnah Berurah 61:18–20.
• Mishnah Berurah explains the kavvanah — focused intention required in Shema and warns not to distort the word אֶחָד — One while extending it. This keeps the mitzvah balanced: deep concentration, but correct pronunciation.

Aruch HaShulchan

• Source: Aruch HaShulchan, Orach Chaim 61:10–11.
• Aruch HaShulchan explains that Shema is the daily acceptance of Hashem’s unity and kingship. He emphasizes that the first pasuk must be said with seriousness, because it contains the foundation of Jewish faith.

Chasam Sofer

• Source: Chasam Sofer, Toras Moshe, Va’eschanan, s.v. “שְׁמַע יִשְׂרָאֵל.”
• Chasam Sofer explains that Shema gathers all Jewish faith into one declaration. A Jew says it not only as belief, but as testimony. The mitzvah makes each person a witness that Hashem alone rules the world.

Netziv

• Source: Netziv, HaEmek Davar on Devarim 6:4.
• Netziv emphasizes that Shema is addressed to Israel as a nation. The mitzvah of Hashem’s unity is carried by Klal Yisrael together. Each Jew accepts it personally, but the declaration belongs to the whole people.

Rav Shimshon Raphael Hirsch

• Source: Rav Hirsch on Devarim 6:4.
• Rav Hirsch teaches that Hashem’s unity means that every force in life is under one moral and Divine rule. Nature, history, private life, and national life are not separate powers. All stand before the One Hashem.

Malbim

• Source: Malbim on Devarim 6:4.
• Malbim explains that Shema teaches both Hashem’s uniqueness and His unity. Hashem is not merely the greatest power. He is the only true independent Being. Everything else depends on Him.

Meshech Chochmah

• Source: Meshech Chochmah on Devarim 6:4.
• Meshech Chochmah explains that the declaration of Hashem’s unity must shape action and national life. Belief is not left in the mind alone. A people who knows Hashem is One must live with one center and one loyalty.

Rav Kook

• Source: Rav Avraham Yitzchok HaCohen Kook, Orot HaKodesh II, p. 399.
• Rav Kook teaches that the unity of Hashem is the deepest unity behind all existence. The more a person grows in Torah, the more he sees that scattered parts of life are held together by one Divine Source. יִחוּד ה׳ — the unity of Hashem brings peace to thought and soul.

Baal Shem Tov

• Source: Baal Shem Tov al HaTorah, Va’eschanan.
• The Baal Shem Tov teaches that Hashem’s presence fills and sustains every moment of existence. יִחוּד ה׳ — the unity of Hashem is not distant philosophy. It means that every event, place, and breath is alive from Hashem.

Tanya

• Source: Tanya, Shaar HaYichud VehaEmunah, Chapter 1.
• Tanya explains that all creation exists only because Hashem constantly brings it into being. The world has no independent existence apart from His will. This gives the mitzvah of Hashem’s unity deep inner meaning: everything is dependent on Him at every moment.

Sfas Emes

• Source: Sfas Emes, Va’eschanan 5632.
• Sfas Emes teaches that Shema helps a Jew uncover the hidden unity inside a divided world. Life appears scattered, but the Jew declares that everything comes from One. Saying Shema brings the soul back to its root.

Kedushas Levi

• Source: Kedushas Levi, Va’eschanan, s.v. “שְׁמַע יִשְׂרָאֵל.”
• Kedushas Levi presents Shema as a declaration of love and attachment. When a Jew says Hashem is One, he is not only stating truth. He is giving himself to Hashem and accepting that his life belongs to the One who loves Israel.

Shem MiShmuel

• Source: Shem MiShmuel, Va’eschanan 5672.
• Shem MiShmuel explains that Shema gathers the scattered powers of a person into one center. Thoughts, desires, fears, and actions can pull in many directions. יִחוּד ה׳ — the unity of Hashem helps the soul become unified in service.

Ramchal

• Source: Ramchal, Derech Hashem 1:1:6.
• Ramchal teaches that Hashem is the only Being whose existence is absolute and independent. Everything else exists only because He wills it to exist. This is the root of all avodah — service: the person stands before the One true Source of all.

Mitzvah 3 is one of the core foundations of Torah belief. It follows Mitzvah 1, to know that there is a G-d, and Mitzvah 2, not to entertain thoughts of other gods. Mitzvah 3 teaches that Hashem is not only real. He is One.

The mitzvah is expressed in Shema, one of the most central passages in Jewish life. A Jew says it morning and evening. It is taught to children, said before sleep, and held by Jews in moments of danger and sacrifice. Shema carries the pure faith of Klal Yisrael.

This mitzvah also stands against all forms of idolatry. Idolatry divides power. It imagines that different forces control different parts of life. יִחוּד ה׳ — the unity of Hashem teaches that all power, all life, and all existence come from one Source.

The mitzvah does not remain only in belief. It shapes how a Jew lives. If Hashem is One, then Torah is one, life is one, and every part of existence can be brought into avodas Hashem — service of Hashem.