2. Sanctify unto me all the first-born. This also refers to the First Commandment, because God asserts His right over the first-born, lest the recollection of their redemption should ever be lost. For thus were the Israelites admonished that they must honor that God by whose grace they had escaped in safety from the common destruction of Egypt, and, moreover, that they were rescued by His special blessing, in order that they should consecrate themselves to God their Deliverer. For the offering which He here requires, was a mark of separation between them and the heathen nations. (328) The first-born is called the opening of the womb, because it is the beginning of generation. The expression, “among the children of Israel,” when he is speaking of brutes, as well as of their own offspring and children, is meant to distinguish the wild beasts from the tame and domestic animals. But although He commands only the first-born of the race of Abraham to be offered to Him, still this must undoubtedly be extended to the sanctification of the whole people; for whilst He says, that the first-born were His, because they especially owed their preservation to His mercy, yet for the same reason he signifies that all were His own.
(328) Omitted in Fr.