Exodus 24:15
And Moses went up into the mount, and a cloud covered the mount.
Cross-reference
In Exodus 24:2, only Moses may approach the Lord — here he goes up alone, fulfilling that instruction.
Exodus 24:12 is the command to ascend the mountain that Moses follows here — the cloud covering signals God's presence as Moses goes to receive the law.
In Exodus 19:9, God promises to come in a thick cloud — now the same cloud covers the mountain as Moses ascends.
Exodus 19:16 describes a thick cloud on Sinai — here the cloud again covers the mountain as Moses goes up.
In Exodus 19:3, Moses went up to God on the mountain — a similar ascent to the one here.
In Matthew 17:5, a bright cloud overshadows Jesus at the transfiguration — a typological echo of the cloud on Sinai.
Deuteronomy 9:9 recalls this same event, adding that Moses spent forty days and nights without food or water on the mountain.
In 2 Chronicles 6:1, Solomon says the Lord dwells in thick darkness — echoing the cloud covering Sinai here.