Numbers 7:9

But to the sons of Kohath he gave no wagons or oxen, because they serve in the Sanctuary and they carry their burdens on their shoulders

Other versions

King James Version

But unto the sons of Kohath he gave none: because the service of the sanctuary belonging unto them was that they should bear upon their shoulders.

English Standard Version

But to the sons of Kohath he gave none, because they were charged with the service of the holy things that had to be carried on the shoulder.

New International Version

But Moses did not give any to the Kohathites, because they were to carry on their shoulders the holy things, for which they were responsible.