Exodus 34:22-26

22“You must celebrate the Festival of Harvest with the first crop of the wheat harvest, and celebrate the Festival of the Final Harvest at the end of the harvest season.

23Three times each year every man in Israel must appear before the Sovereign, the Lord, the God of Israel.

24I will drive out the other nations ahead of you and expand your territory, so no one will covet and conquer your land while you appear before the Lord your God three times each year.

25“You must not offer the blood of my sacrificial offerings together with any baked goods containing yeast. And none of the meat of the Passover sacrifice may be kept over until the next morning.

26“As you harvest your crops, bring the very best of the first harvest to the house of the Lord your God. “You must not cook a young goat in its mother’s milk.”