וְלֹ֤א יָֽכְלוּ֙ הַכֹּ֣הֲנִ֔ים לָב֖וֹא אֶל־בֵּ֣ית יְהוָ֑ה כִּֽי־מָלֵ֥א כְבוֹד־יְהוָ֖ה אֶת־בֵּ֥ית יְהוָֽה׃
And the priests could not enter into the house of the LORD, because the glory of the LORD filled the LORD’S house.
Read midrashic interpretation of II Chronicles 7:2: and classical rabbinic exegesis.