Exodus 40:31-35

And Moses and Aaron and his sons washed their hands and their feet thereat:

When they went into the tent of the congregation, and when they came near unto the altar, they washed; as the LORD commanded Moses.

And he reared up the court round about the tabernacle and the altar, and set up the hanging of the court gate. So Moses finished the work.

Then a cloud covered the tent of the congregation, and the glory of the LORD filled the tabernacle.

And Moses was not able to enter into the tent of the congregation, because the cloud abode thereon, and the glory of the LORD filled the tabernacle.