Exodus 34:17-19 American Standard Version (ASV)
17 Thou shalt make thee no molten gods.
18 The feast of unleavened bread shalt thou keep. Seven days thou shalt eat unleavened bread, as I commanded thee, at the time appointed in the month Abib; for in the month Abib thou camest out from Egypt. 19 All that openeth the womb is mine; and all thy cattle that is male, the firstlings of cow and sheep.