The account of the giving of the law through Moses on Mount Sinai (Exodus 19:9-25) makes no mention of angels, although it does record the prolonged sounding of a trumpet. Apparently a mighty host of angels was present. Deuteronomy 33:2 mentions "ten thousands of saints" as "the LORD came from Sinai" (Psalm 68:17; Acts 7:53).

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8