Exodus 13:2

2“Sanctify to me every firstborn which opens the womb among the sons of Israel, as much of men as of cattle. For they are all mine.”
13:2 Sanctify unto me every firstborn: Sanctification in this place means that the firstborn males of the Hebrews should be deputed to the ministry in the divine worship; and the firstborn of beasts to be given for a sacrifice.(Challoner)

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