Exodus 12:50-13:2

50All the Israelites did just what the LORD had commanded Moses and Aaron. 51And on that very day the LORD brought the Israelites out of Egypt by their divisions.

Consecration of the Firstborn 1The LORD said to Moses,

2“Consecrate to me every firstborn male. The first offspring of every womb among the Israelites belongs to me, whether human or animal.”