Numbers 7:9

But he did not give any to the Kohathites, since their responsibility was service related to the holy objects carried on their shoulders.

Numbers 3:31

Their duties involved the ark, the table, the lampstand, the altars, the sanctuary utensils that were used with these, and the screen—and all the work relating to them.

2 Samuel 6:13

When those carrying the ark of the Lord advanced six steps, he sacrificed an ox and a fattened calf.

Numbers 4:4-16

“The service of the Kohathites at the tent of meeting concerns the most holy objects.

2 Samuel 6:6

When they came to Nacon’s threshing floor, Uzzah reached out to the ark of God and took hold of it because the oxen had stumbled.

1 Chronicles 15:3

David assembled all Israel at Jerusalem to bring the ark of the Lord to the place he had prepared for it.

1 Chronicles 15:13

For the Lord our God burst out in anger against us because you Levites were not with us the first time, for we didn’t inquire of Him about the proper procedures.”

1 Chronicles 23:26

Also, the Levites no longer need to carry the tabernacle or any of the equipment 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 duties involved the ark, the table, the lampstand, the altars, the sanctuary utensils that were used with these, and the screen—and all the work relating to them.
Numbers 4:4
“The service of the Kohathites at the tent of meeting concerns the most holy objects.
2 Samuel 6:6
When they came to Nacon’s threshing floor, Uzzah reached out to the ark of God and took hold of it because the oxen had stumbled.
1 Chronicles 15:3
David assembled all Israel at Jerusalem to bring the ark of the Lord to the place he had prepared for it.
1 Chronicles 23:26
Also, the Levites no longer need to carry the tabernacle or any of the equipment for its service”

Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.