Leviticus 22:27-33

²⁷'When ox or lamb or goat is born, and it hath been seven days under its dam, then from the eighth day and henceforth, it is pleasing for an offering, a fire-offering to Jehovah;

²⁸but an ox or sheep — it and its young one, ye do not slaughter in one day.

²⁹'And when ye sacrifice a sacrifice of thanksgiving to Jehovah, at your pleasure ye do sacrifice,

³⁰on that day it is eaten, ye do not leave of it till morning; I am Jehovah;

³¹and ye have kept my commands, and have done them; I am Jehovah;

³²and ye do not pollute My holy name, and I have been hallowed in the midst of the sons of Israel; I am Jehovah, sanctifying you,

³³who am bringing you up out of the land of Egypt, to become your God; I am Jehovah.'