Numbers 4:5

4:5 When it is time for the camp to journey, Aaron and his sons must come and take down the screening curtain and cover the ark of the testimony with it.

Numbers 9:15

The Leading of the Lord

9:15 On the day that the tabernacle was set up, the cloud covered the tabernacle – the tent of the testimony – and from evening until morning there was a fiery appearance over the tabernacle.

Numbers 18:2

18:2 “Bring with you your brothers, the tribe of Levi, the tribe of your father, so that they may join with you and minister to you while you and your sons with you are before the tent of the testimony.