# See

"Look" or "Listen" or "Pay attention to what I am about to tell you"

# Yahweh rides on a swift cloud

Yahweh seems to be pictured here as riding on a cloud as if he was riding in a chariot.

# the idols of Egypt quake before him

"the idols of Egypt tremble in fear before Yahweh" 

# the hearts of the Egyptians melt within themselves

"the Egyptians have no more courage"