Numbers 3:12
When God miraculously destroyed all the first-born of the Egyptians, (Ex 12:29,) he spared those of the Israelites; and, in commemoration of that event, he was pleased to appoint that all the first-born males "should be set apart unto himself." (Ex 13:12-16.) God is here pleased to relinquish this claim, and to appoint the whole tribe of Levi to attend his immediate service in their stead.
Numbers 8:16
entirely given <05414> [wholly given.]
{Nethunim, nethunim,} "given; given;" The word being repeated, "because," says Bp. Patrick, "the children of Israel had devoted them to him, by laying their hands upon them, (ver. 10,) and Aaron had waved them as a wave-offering to the Lord." (ver. 11.)
open <06363> [instead of such.]
Houbigant, on the authority of the Samaritan, reads, "instead of every first-born of the children of Israel, who openeth the womb."
Numbers 18:15
firstborn <06363> [openeth.]
firstborn sons ....... firstborn <01060> [the firstborn.]