Exodus 12:1

The Institution of the Passover

12:1 The Lord said to Moses and Aaron in the land of Egypt,

Exodus 12:15

12:15 For seven days you must eat bread made without yeast. Surely on the first day you must put away yeast from your houses because anyone who eats bread made with yeast from the first day to the seventh day will be cut off from Israel.

Leviticus 23:5-6

23:5 In the first month, on the fourteenth day of the month, at twilight, is a Passover offering to the Lord. 23:6 Then on the fifteenth day of the same month will be the festival of unleavened bread to the Lord; seven days you must eat unleavened bread.

Numbers 28:16

Passover and Unleavened Bread

28:16 “‘On the fourteenth day of the first month is the Lord’s Passover.