Num Numbers, chapter Book of Numbers, chapter 3
“Behold, I have taken the Levites from among the children of Israel in place of every firstborn Israelite from the womb. The Levites belong to Me, Exo 29:24; Num 8:16for all the firstborn are Mine. On the day I struck down every firstborn in the land of Egypt, I consecrated to Myself all the firstborn in Israel, both man and beast. They are Mine; I am the LORD.”Exo 13:2; Exo 22:29; Exo 34:19; Lev 27:26; Num 8:17; Luk 2:23