Exodus 12:2
"This month is the beginning of months for you; it shall be the first month of your year.

Exodus 23:15
You are to observe the Feast of Unleavened Bread as I commanded you: At the appointed time in the month of Abib you are to eat unleavened bread for seven days, because that was the month you came out of Egypt. No one may appear before Me empty-handed.

Exodus 34:18
You are to observe the Feast of Unleavened Bread. For seven days at the appointed time in the month of Abib, you are to eat unleavened bread as I commanded you. For in the month of Abib you came out of Egypt.

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