2. Sanctify unto me all the first-born—To "sanctify" means to "consecrate," to "set apart" from a common to a sacred use. The foundation of this duty rested on the fact that the Israelites, having had their first-born preserved by a distinguishing act of grace from the general destruction that overtook the families of the Egyptians, were bound in token of gratitude to consider them as the Lord's peculiar property (compare Heb 12:23).

     Ex 13:3-10. MEMORIAL OF THE PASSOVER.