In which month was Israel to keep the Feast of Unleavened Bread, the month they left Egypt?

Answer: Abib

Israel was to eat unleavened bread seven days at the appointed time in the month of Abib, for in it they came out of Egypt.

“You are to keep 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 23:15 (BSB)