Exodus 19:16

There were thunders and lightnings— The most formidable agents in nature, air, fire, and light, in their most dreadful exertions, attended the Divinity on this solemn occasion: a retinue of glorious angels, bright as the living flame, surrounded him, Deuteronomy 32:2. All nature expressed the most extraordinary commotion at his presence; and a sound, like that of a trumpet, was sent forth by his angelic ministers, as the summons to appear before him. No circumstances can be more truly awful, than these mentioned by the sacred historian; as, perhaps, there never was upon earth so solemn and majestic a display of the Divine glory. See Psalms 68:8. Joshua 5:4 and Deuteronomy 4:11.