Kutoka 13 : 12 Exodus chapter 13 verse 12

ndipo utamwekea Bwana kila afunguaye tumbo, na kila mzaliwa wa kwanza uliye naye, azaliwaye na mnyama; hao waume watakuwa ni wa Bwana.
soma Mlango wa 13

that you shall set apart to Yahweh all that opens the womb, and every firstborn which you have that comes from an animal. The males shall be Yahweh's.