Numbers 7:9

But to the descendants of Kohath he did not give [anything] because the work of the sanctuary they carried upon them on their shoulders.

Numbers 3:31

Their responsibility [was] the ark, the table, the lampstand, the altar, and the vessels of the sanctuary, with which they ministered, and the curtain, and all of its use.

2 Samuel 6:13

It happened [that] when the carriers of the ark of Yahweh had marched six steps that he sacrificed an ox and a fatling.

Numbers 4:4-16

This [is] the work of the descendants of Kohath in the tent of assembly, concerning the holiness of the sanctuary:

2 Samuel 6:6

When they came to the threshing floor of Nakon, Uzza reached out to the ark of God and took hold of [it], because the oxen had stumbled.

1 Chronicles 15:3

And David gathered all Israel to Jerusalem to bring up the ark of Yahweh to its place that he had established for it.

1 Chronicles 15:13

Because the first time you did not, [and] Yahweh our God burst out against us, for we did not care for it according to the law."

1 Chronicles 23:26

And also, the Levites do not [need] to carry the tabernacle and all 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
Their responsibility [was] the ark, the table, the lampstand, the altar, and the vessels of the sanctuary, with which they ministered, and the curtain, and all of its use.
Numbers 4:4
This [is] the work of the descendants of Kohath in the tent of assembly, concerning the holiness of the sanctuary:
2 Samuel 6:6
When they came to the threshing floor of Nakon, Uzza reached out to the ark of God and took hold of [it], because the oxen had stumbled.
1 Chronicles 15:3
And David gathered all Israel to Jerusalem to bring up the ark of Yahweh to its place that he had established for it.
1 Chronicles 23:26
And also, the Levites do not [need] to carry the tabernacle and all its vessels for its service."