Exodus 13:2

Overview - Exodus 13
The firstborn are sanctified to God.
The memorial of the passover is commanded.
11 The firstlings of man and beast are set apart.
17 The Israelites go out of Egypt, and carry Joseph's bones with them.
20 They come to Etham.
21 God guides them by a pillar of a cloud, and a pillar of fire.
Treasury of Scripture Knowledge

Exodus 13:2  (King James Version)
Sanctify unto me all the firstborn, whatsoever openeth the womb among the children of Israel, both of man and of beast: it is mine.

The word {kadash} is to consecrate, separate, and set apart a person or thing from all common or secular purposes to some religious use; and exactly answers to the Greek [hagiazo,] from [a,] privative, and [g,] the earth; because everything offered or consecrated to God was separated from all earthly uses.
12-15 ; 4:22 Exodus 22:29 Exodus 22:30 23:19 Exodus 34:19 Exodus 34:20 Leviticus 27:26 ; Numbers 3:13 ; Numbers 8:16 Numbers 8:17
Numbers 18:15 ; Deuteronomy 15:19 ; Luke 2:23 ; Hebrews 12:23