Exodus 13:10-12

New International Version - UK

¹⁰ You must keep this ordinance at the appointed time year after year.

¹¹ ‘After the Lord brings you into the land of the Canaanites and gives it to you, as he promised on oath to you and your ancestors, ¹² you are to give over to the Lord the first offspring of every womb. All the firstborn males of your livestock belong to the Lord.