Exodus 34:23-25

New International Version - UK

²³ Three times a year all your men are to appear before the Sovereign Lord, the God of Israel. ²⁴ I will drive out nations before you and enlarge your territory, and no one will covet your land when you go up three times each year to appear before the Lord your God.

²⁵ ‘Do not offer the blood of a sacrifice to me along with anything containing yeast, and do not let any of the sacrifice from the Passover Festival remain until morning.