Numbers 7:10

“And the princes offered for dedicating of the altar, etc.] 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 offered their offering before the altar; the altar of burnt offering; they brought their vessels for the service of it, and the creatures for sacrifice, and set them before it; signifying what they meant, thereby, that the silver and golden vessels were for the use of it, and the beasts for sacrifice to be offered up on it: and here Jarchi…”

“the princes offered for dedicating of the altar, &c.--"Altar" is here used in the singular for the plural; for it is evident, from the kind of offerings, that the altars of burnt offering and incense are both referred to. This was not the first or proper dedication of those altars, which had been made by Moses and Aaron some time before [Lev 8:11]. But it might be considered an additional "dedication"--those offerings being the first that were made for particular persons or tribes.”

“The altar - Of burnt - offerings, and incense too, as appears from the matter of their offerings. Not for the first dedication of them, for it is apparent they were dedicated or consecrated before this time by Moses and Aaron: but for a farther dedication of them, these being the first offerings that were made for any particular persons or tribes. In the day - That is, about the time, as soon as it was anointed. Numbers 7:11”

“7:10-11 In addition to the wagons and oxen, the tribal leaders also presented gifts of silver and gold vessels and other religious offerings for the altar at the time it was anointed. Beginning with the tribe of Judah, the tribal leaders brought these gifts to the Tabernacle on twelve consecutive days. The gifts came from items collected from the Egyptians when Israel departed from Egypt (cp. Exod 12:35-36; 25:3).”

“princes: Every prince, or chief, offered in the behalf, and doubtless at the expense, of his whole tribe. dedicating: Deu 20:5; Kg1 8:63; Ch2 7:5, Ch2 7:9; Ezr 6:16, Ezr 6:17; Neh 12:27, Neh 12:43; Psa 30:1 \*title Joh 10:22 Numbers 7:11”

“Presentation of dedicatory gifts for the altar. - Num 7:10. Every prince offered "the dedication of the altar," i.e., what served for the dedication of the altar, equivalent to his sacrificial gift for the consecration of the altar, "on the day," i.e., at the time, "that they anointed it." "Day:" as in Gen 2:4. Moses was directed by God to receive the gifts from the princes on separate days, one after another; so that the presentation extended over twelve days. The reason for this regulation was not to make a greater display, as Knobel supposes, or to avoid cutting short the important ceremony of consecration, but was involved in the very nature of the gifts presented. Each prince, for…”