Exodus 13:2

XIII.
SANCTIFICATION OF THE FIRSTBORN, AND LAW OF REDEMPTION.

(2) Sanctify unto me all the firstborn. — It was a reasonable demand that the existing firstborn of Israel, spared by God when the Egyptian firstborn were destroyed, should be regarded thenceforth as His, and set apart for His service. The extension of the demand to existing beasts was also reasonable, since they too had been spared. God’s further requirement, that henceforth all the future firstborn should also be His, was intended to perpetuate the memory of the recent deliverance, and to help to fix it in the mind of the nation. The substitution of a redemption in the case of unclean beasts was necessitated by the circumstances of the case, since they could not be sacrificed; and the redemption of the firstborn sons naturally followed when the Levitical priesthood was established, and their services were no longer necessary. (See Numbers 3:40; Numbers 18:16.) The Jews still observe the ordinance, so far as the children are concerned, and redeem the son which has “opened the womb” on the thirtieth day after the birth.