Exodus 23:16-19

“Second, celebrate the Festival of Harvest, when you bring me the first crops of your harvest. “Finally, celebrate the Festival of the Final Harvest at the end of the harvest season, when you have harvested all the crops from your fields. At these three times each year, every man in Israel must appear before the Sovereign, the LORD. “You must not offer the blood of my sacrificial offerings together with any baked goods containing yeast. And do not leave the fat from the festival offerings until the next morning. “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.