Exodus 34:23-25

Living Bible

²³ On each of these three occasions all the men and boys of Israel shall appear before the Lord. ²⁴ No one will attack and conquer your land when you go up to appear before the Lord your God those three times each year. For I will drive out the nations from before you and enlarge your boundaries.

²⁵ “You must not use leavened bread with your sacrifices to me, and none of the meat of the Passover lamb may be kept over until the following morning.