(Exodus 14:27) "And Moses stretched forth his hand upon the sea, and the sea returned towards morning to eithano. "eithano" signifies "His strength" as in (Numbers 24:21) "Eithan is your dwelling." R. Nathan says: "Eithan" signifies "hardness," as in (Jeremiah 5:15) "Behold, I am bringing against you a nation from afar, house of Israel, says the L–rd, a nation that is eithan, an enduring nation." "And Egypt fled towards it": to apprise you that wherever Egypt fled, the sea pursued it.
Moses Stretched Forth His Hand Upon
Mekhilta Tractate Vayehi Beshalach 7:4