One young bullock As these sacrifices were so many, it is probable that the rest of the great men of the tribe of Judah joined with Nahshon in their contributions toward them, and that he offered in their names. And the same is to be observed as to the offerings of the other chiefs. For a burnt-offering This signified their dedicating themselves wholly to God; see on Leviticus 1:3. For a sin-offering As an acknowledgment of their sinfulness before God, and a sign of their application to his mercy for pardon. Though the sin-offering is here mentioned after the burnt-offering, yet it was commonly offered first, it being most fit that men should begin their religious addresses to God with acts of humiliation, and expressions of repentance. See on Leviticus 8:22.
Related Commentaries of Numbers 7:15
Numbers 7:15-16
15 One young bullock, one ram, one lamb of the first year, for a burnt offering:
16 One kid of the goats for a sin offering: