John Gill Commentary 2 Chronicles 7:2

"And the priests could not enter into the house of Jehovah, because the glory of Jehovah filled Jehovah`s house." — 2 Chronicles 7:2 (ASV)

And the priests could not enter into the house of the Lord , &c.] They went in to carry the ark there, but not being able to stand to minister, they came out, and could not re-enter:

because the glory of the Lord had filled the Lord's house ; both the holy place, and the holy of holies, see (1 Kings 8:10 1 Kings 8:11) .