Then will the LORD create, over the whole site of Mount Zion and over her place of assembly, A smoking cloud by day and a light of flaming fire by night. For over all, the LORD's glory will be shelter and protection. (Is 4:2-6)
https://bible.usccb.org/bible/readings/112822.cfm
A cloud by day, a pillar of fire by night—recalls the Divine Presence during the Exodus from Egypt. “On that day” is a reference to the “great and terrible Day of the Lord.” But instead of provoking “fear and trembling” the coming of the LORD’s glory, God’s presence with us, will be “shelter and protection.” The message of Advent is a message of hope. Advent proclaims not “fear and trembling” but rather “shelter and protection.”