Deuteronomy 16:1-3

New Century Version

The Passover

16 Celebrate the Passover of the Lord your God during the month of Abib, because it was during Abib that he brought you out of Egypt at night. ² As the sacrifice for the Passover to the Lord your God, offer an animal from your flock or herd at the place the Lord will choose to be worshiped. ³ Do not eat it with bread made with yeast. But for seven days eat bread made without yeast, the bread of suffering, because you left Egypt in a hurry. So all your life you will remember the time you left Egypt.