Exodus 13:2-4 New International Version - UK (NIVUK)
2 ‘Consecrate to me every firstborn male. The first offspring of every womb among the Israelites belongs to me, whether human or animal.’
3 Then Moses said to the people, ‘Commemorate this day, the day you came out of Egypt, out of the land of slavery, because the Lord brought you out of it with a mighty hand. Eat nothing containing yeast. 4 Today, in the month of Aviv, you are leaving.