Deuteronomy 16:1-2

Darby Translation

16 Keep the month of Abib, and celebrate the passover to Jehovah thy God; for in the month of Abib Jehovah thy God brought thee forth out of Egypt by night.

² And thou shalt sacrifice the passover to Jehovah thy God, of the flock and of the herd, in the place which Jehovah will choose to cause his name to dwell there.