Exodus 34:23-25

Amplified Bible

²³ Three times a year all your males shall appear before the Lord ^[a]God, the God of Israel. ²⁴ For I will drive out and dispossess nations before you and enlarge your borders; nor shall any man covet (actively seek for himself) your land when you go up to appear before the Lord your God three times a year.

²⁵ “You shall not offer the blood of My sacrifice with leavened bread, nor shall the sacrifice of the Feast of the Passover (Unleavened Bread) be left over until morning.