When the altar was anointed, the leaders approached with their offerings for its dedication and presented them before the altar.
10. And the princes offered for dedicating of the altar Here is another kind of offering, viz., a silver dish and bowl from every tribe, besides a golden spoon, V., mortariolum. LXX.,: θυί̑σκη Ainsworth, cup. Heb., כן from whence probably our English word cup. which properly means a censer.
We have here an account of the great solemnity of dedicating the altars, both that of burnt-offerings and that of incense; they had been sanctified before, when they were anointed (Lev 8:10, Lev 8:11), but now they were handselled, as it were, by the princes, with their free-will offerings.
Commenting on Numbers 7:10-89
And the princes offered for dedicating of the altar,.... For setting it apart to sacred use and service, even the altar of burnt offering; or rather after it had bean sanctified and set apart, when it began to be made use of for sacrifice: in the day that it was anointed; with the anointing oil, whereby it was devoted to sacred service: even the princes...