Not to reproduce the incense formula (for personal use)

This mitzvah prohibits reproducing the precise formula of the Ketoret (incense) outside of its sacred Temple use. The Ketoret was a unique blend of eleven spices, prepared daily by the Kohanim and burned on the Golden Altar in the Sanctuary. It produced a miraculous fragrance that spread across Jerusalem and symbolized prayer and devotion rising to Heaven.

Rambam explains that one who recreates the formula for personal pleasure is liable to karet (spiritual excision), underscoring the severity of profaning this sacred service. Sefer HaChinuch teaches that the Ketoret’s sanctity lies in its unique designation for Hashem alone, and duplicating it for secular enjoyment would diminish its holiness.

The mitzvah highlights the principle that what is designated for Hashem cannot be appropriated for mundane use. It separates the sacred from the profane, reminding Israel that holiness must remain pure, undiluted, and devoted solely to Divine service.

Commentary & Classical Explanation:

• Rambam (Hilchot Klei HaMikdash 2:1–8): Codifies the Ketoret’s formula and warns against its reproduction for non-sacred use.
• Sefer HaChinuch (Mitzvah 110): Explains that the prohibition maintains awe and reverence by preventing people from reducing the Ketoret to a perfume.
• Rashi (Exodus 30:37): Notes that “for yourselves” means for personal pleasure, as opposed to the Temple service.
• Talmud (Keritot 6a): States that one who duplicates the formula for enjoyment is liable to karet.
• Ramban (Ex. 30:37): Stresses that the Ketoret was holy only because of its purpose, not merely its ingredients.