Numbers 7:9

But to the sons of Kohath he did not give any, because the service of the sanctuary belonging to them was that which they should carry upon their shoulders.

Numbers 3:31

And their charge shall be the ark, and the table, and the lampstand, and the altars, and the vessels of the sanctuary with which they minister, and the veil, and all the service of it.

2 Samuel 6:13

And it happened that when those who bore the ark of Jehovah had gone six steps, he sacrificed oxen and fatlings.

Numbers 4:4-16

This shall be the service of the sons of Kohath in the tabernacle of the congregation, the most holy place.

2 Samuel 6:6

And when they came to Nachon's threshing-floor, Uzzah reached out to the ark of God, and took hold of it; for the oxen upset it.

1 Chronicles 15:3

And David gathered all Israel together to Jerusalem, to bring up the ark of Jehovah to its place which he had prepared for it.

1 Chronicles 15:13

For because you did not do it at the first, Jehovah our God made a break on us, since we did not seek Him in due order.

1 Chronicles 23:26

and also to the Levites, so that they shall no more carry the tabernacle, nor any of its vessels for its service.

Treasury of Scripture Knowledge

Summary

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.

Bible References

Because

Numbers 3:31
And their charge shall be the ark, and the table, and the lampstand, and the altars, and the vessels of the sanctuary with which they minister, and the veil, and all the service of it.
Numbers 4:4
This shall be the service of the sons of Kohath in the tabernacle of the congregation, the most holy place.
2 Samuel 6:6
And when they came to Nachon's threshing-floor, Uzzah reached out to the ark of God, and took hold of it; for the oxen upset it.
1 Chronicles 15:3
And David gathered all Israel together to Jerusalem, to bring up the ark of Jehovah to its place which he had prepared for it.
1 Chronicles 23:26
and also to the Levites, so that they shall no more carry the tabernacle, nor any of its vessels for its service.