Exodus 12:2
"This month shall be for you the beginning of months. It shall be the first month of the year for you.

Exodus 23:15
You shall keep the Feast of Unleavened Bread. As I commanded you, you shall eat unleavened bread for seven days at the appointed time in the month of Abib, for in it you came out of Egypt. None shall appear before me empty-handed.

Exodus 34:18
"You shall keep the Feast of Unleavened Bread. Seven days you shall eat unleavened bread, as I commanded you, at the time appointed in the month Abib, for in the month Abib you came out from Egypt.

Deuteronomy 16:1
"Observe the month of Abib and keep the Passover to the LORD your God, for in the month of Abib the LORD your God brought you out of Egypt by night.