John Gill Commentary Numbers 7:6

"And Moses took the wagons and the oxen, and gave them unto the Levites." — Numbers 7:6 (ASV)

And Moses took the wagons and the oxen
Of the princes, as he was directed:

and gave them unto the Levites ;
the Gershonites and Merarites; for, as for the Kohathites, they had no part of them, for a reason after given, (Numbers 7:9) .