Exodus 34:25-27

King James Version

²⁵ Thou shalt not offer the blood of my sacrifice with leaven; neither shall the sacrifice of the feast of the passover be left unto the morning.

²⁶ The first of the firstfruits of thy land thou shalt bring unto the house of the Lord thy God. Thou shalt not seethe a kid in his mother's milk.

²⁷ And the Lord said unto Moses, Write thou these words: for after the tenor of these words I have made a covenant with thee and with Israel.