Genesis 45:19
You are also directed to tell them: 'Take wagons from the land of Egypt for your young children and your wives, and bring your father and come back.

Numbers 7:5
"Accept these gifts from them, that they may be used in the work of the Tent of Meeting. And give them to the Levites, to every man according to his service."

Numbers 7:7
He gave the Gershonites two carts and four oxen, as their service required,