Numbers 7:9

But unto the sons of Kohath he gave none, because the service of the sanctuary belonged unto them; they bare it upon their shoulders.

Numbers 3:31

And their charge shall be the ark, and the table, and the candlestick, and the altars, and the vessels of the sanctuary wherewith they minister, and the screen, and all the service thereof.

2 Samuel 6:13

And it was so, that, when they that bare the ark of Jehovah had gone six paces, he sacrificed an ox and a fatling.

Numbers 4:4-16

This is the service of the sons of Kohath in the tent of meeting, about the most holy things:

2 Samuel 6:6

And when they came to the threshing-floor of Nacon, Uzzah put forth his hand to the ark of God, and took hold of it; for the oxen stumbled.

1 Chronicles 15:3

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

1 Chronicles 15:13

For because ye bare it not at the first, Jehovah our God made a breach upon us, for that we sought him not according to the ordinance.

1 Chronicles 23:26

and also the Levites shall no more have need to carry the tabernacle and all the vessels of it for the service thereof.

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 candlestick, and the altars, and the vessels of the sanctuary wherewith they minister, and the screen, and all the service thereof.
Numbers 4:4
This is the service of the sons of Kohath in the tent of meeting, about the most holy things:
2 Samuel 6:6
And when they came to the threshing-floor of Nacon, Uzzah put forth his hand to the ark of God, and took hold of it; for the oxen stumbled.
1 Chronicles 15:3
And David assembled all Israel at Jerusalem, to bring up the ark of Jehovah unto its place, which he had prepared for it.
1 Chronicles 23:26
and also the Levites shall no more have need to carry the tabernacle and all the vessels of it for the service thereof.

American Standard Version Public Domain