Exodus 34:22-26

“And you shall observe the Feast of Weeks, of the firstfruits of wheat harvest, and the Feast of Ingathering at the year’s end. “Three times in the year all your men shall appear before the Lord, the LORD God of Israel. For I will cast out the nations before you and enlarge your borders; neither will any man covet your land when you go up to appear before the LORD your God three times in the year. “You shall not offer the blood of My sacrifice with leaven, nor shall the sacrifice of the Feast of the Passover be left until morning. “The first of the firstfruits of your land you shall bring to the house of the LORD your God. You shall not boil a young goat in its mother’s milk.”