Sefer HaMitzvot, Negative Commandments
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הזהירנו שלא לגוז צמרי קדשים. והוא אמרו יתעלה ולא תגוז בכור צאנך ולמדנו שאר קדשים מבכור שהם כלם אסורין בגזה. וכבר התבארו דיני מצוה זו ומצות עבודה בככורות, ומי שגזז דבר מן הקדשים לוקה. (שם, שם):
He prohibited us from shearing the wool of consecrated animals. And that is His, may He be exalted, saying, "and you shall not shear the firstborn of your flock " (Deuteronomy 15:19). And we learned the other consecrated animals from the firstborn, that they are all forbidden to shear. And the laws of this commandment and the commandment of working with firstborns have been explained in Bekhorot. And one who shears anything from consecrated animals is lashed. (See Parashat Re'eh; Mishneh Torah, Trespass 1.)