Exodus 13:4

"The feast of unleavened bread shalt thou keep. Seven days thou shalt eat unleavened bread, as I commanded thee, in the time of the month Abib: for in the month Abib thou camest out from Egypt."

"Thou shalt keep the feast of unleavened bread: thou shalt eat unleavened bread seven days, as I commanded thee, in the time appointed of the month Abib; for in it thou camest out from Egypt: and none shall appear before me empty:"

"This month shall be unto you the beginning of months: it shall be the first month of the year to you."