Midrash su Geremia 5:15

(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. An analogy: A dove, fleeing a hawk, enters a king's palace, whereupon the king opens the eastern window for her, whence she escapes. The hawk, following, the king closes all the windows and begins shooting arrows at it. Similarly, when the last of the Israelites ascended from the sea, the first of the Egyptians entered it, whereupon the ministering angels began shooting arrows at them, and hailstones, fire, and sulphur, as it is written (Ezekiel 38:22) "And I will punish him (Gog) with pestilence and with blood, and with torrential rain, and hailstones, fire, and sulphur will I rain upon him and upon his wings, and upon the many peoples that are with him." "And the L rd shook out Egypt": as one shakes out a pot, its bottom ascending, and its top, descending. Variantly: "Vayenaer the L rd, Egypt, etc.": The L rd "invigorated" Egypt in order to (be able to) receive the punishment. Variantly: "Vayenaer the L rd, Egypt, etc.": He delivered them into the hands of "young," cruel angels, viz. (Mishlei 17:11) "And a cruel messenger will be sent against him," and (Iyyov 36:14) "Their souls will expire by youth" ("noar").