The High Priest's breastplate must not be loosened from the Efod (priestly apron)

This mitzvah forbids removing or loosening the breastplate from the ephod of the Kohen Gadol. The Choshen, which contained the Urim and Tumim, symbolized Divine judgment and truth, while the ephod represented service and submission. Bound together with threads of tekhelet, they formed a unified garment, embodying justice and Divine guidance.

Rambam rules that detaching the breastplate, even temporarily, violates this command. The Sefer HaChinuch explains that the symbolism lies in keeping justice inseparably linked to service. The garments were not mere clothing but sacred vessels, and their exact construction and preservation were essential to maintaining sanctity in the Temple.

Rashi highlights that the Torah insists on the Choshen not shifting, for it symbolized Israel’s judgment before Hashem — it must always remain bound to service. Ramban adds that the mitzvah reflects a deeper teaching: justice (Choshen Mishpat) can never stand apart from submission and humility (the ephod), reminding Israel that true judgment belongs only to Hashem.

Commentary & Classical Explanation:

• Rambam (Hilchot Klei HaMikdash 9:7): States that one who separates the Choshen from the ephod transgresses a negative commandment.
• Sefer HaChinuch (Mitzvah 101): Teaches that this command represents the inseparability of justice from sacred service, ensuring integrity in Israel’s spiritual leadership.
• Rashi (Ex. 28:28): Notes that the Choshen must remain tightly bound to symbolize Israel’s judgment always being before Hashem.
• Talmud (Yoma 72a): Discusses the construction and binding of the Choshen, emphasizing its role as the breastplate of judgment.
• Ramban (Ex. 28:28): Interprets that separating the garments would symbolize detaching justice from Divine service, an unacceptable act.