Exodus 3:1

3:1 Now Moses was shepherding the flock of his father-in-law Jethro, the priest of Midian, and he led the flock to the far side of the desert and came to the mountain of God, to Horeb.

Exodus 19:18

19:18 Now Mount Sinai was completely covered with smoke because the Lord had descended on it in fire, and its smoke went up like the smoke of a great furnace, and the whole mountain shook violently.

Malachi 4:4-5

Restoration through the Lord

4:4 “Remember the law of my servant Moses, to whom at Horeb I gave rules and regulations for all Israel to obey. 4:5 Look, I will send you Elijah the prophet before the great and terrible day of the Lord arrives.