Exodus 34:17-19 World English Bible (WEB)
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.