Albert Barnes Commentary Ezekiel 30:9

"In that day shall messengers go forth from before me in ships to make the careless Ethiopians afraid; and there shall be anguish upon them, as in the day of Egypt; for, lo, it cometh." — Ezekiel 30:9 (ASV)

Careless Ethiopians - The Ethiopians, who were dwelling in imagined security (Zephaniah 2:15), will tremble at Egypt’s ruin.