Exodus 34:22-26

22“You must observe the Feast of Weeks – the firstfruits of the harvest of wheat – and the Feast of Ingathering at the end of the year.

23At three times in the year all your men must appear before the Lord God, the God of Israel.

24For I will drive out the nations before you and enlarge your borders; no one will covet your land when you go up to appear before the Lord your God three times in the year.

25“You must not offer the blood of my sacrifice with yeast; the sacrifice from the feast of Passover must not remain until the following morning.

26“The first of the firstfruits of your soil you must bring to the house of the Lord your God. You must not cook a young goat in its mother’s milk.”