Sanctify unto me - The command is addressed to Moses. It was to declare the will of God that all firstborn were to be consecrated to Him, set apart from all other creatures. The command is expressly based upon the Passover. The firstborn exempt from the destruction became in a new and special sense the exclusive property of the Lord: the firstborn of man as His ministers, the firstborn of cattle as victims. In lieu of the firstborn of men the Levites were devoted to the temple services.
Related Commentaries of Exodus 13:2
Exodus 13:2
2 Sanctify unto me all the firstborn, whatsoever openeth the womb among the children of Israel, both of man and of beast: it is mine.