Numbers 7:8-10 New English Translation (NET Bible)
8 and he gave four carts and eight oxen to the Merarites, as their service required, under the authority of Ithamar son of Aaron the priest. 9 But to the Kohathites he gave none, because the service of the holy things, which they carried on their shoulders, was their responsibility.
The Time of Presentation
10 The leaders offered gifts for the dedication of the altar when it was anointed. And the leaders presented their offering before the altar.