Numbers 7:5

Take it of them, that they may be to do the service of the tabernacle of the congregation; and thou shalt give them unto the Levites, to every man according to his service.

Cross-references

Numbers 4:25 details the Gershonites' duty to carry tabernacle curtains — exactly the service for which carts were given in Numbers 7:5.

Exodus 25:1-11 contains God's foundational command to receive offerings for the tabernacle — the same divine directive here.

Exodus 35:4-10 shows the people bringing materials for the tabernacle, mirroring the acceptance of wagons here.