Exodus 34:25-27

Young's Literal Translation

²⁵ `Thou dost not slaughter with a fermented thing the blood of My sacrifice; and the sacrifice of the feast of the passover doth not remain till morning:

²⁶ the first of the first-fruits of the land thou dost bring into the house of Jehovah thy God; thou dost not boil a kid in its mother's milk.'

²⁷ And Jehovah saith unto Moses, `Write for thyself these words, for, according to the tenor of these words I have made with thee a covenant, and with Israel.'