Exodus 34:18 in the King James Version
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.
Context
17 “You shall make no cast idols for yourselves.
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 of Egypt.
19 “All that opens the womb is mine; and all your livestock that is male, the firstborn of cow and sheep.