Midrash su Zaccaria 12:6

It is not written (Exodus 15:7) "He has consumed them as stubble," but "He will consume them as stubble" — in time to come, viz. (Ovadiah 1:18) "And the house of Yaakov will be fire, and the house of Joseph, flame, and the house of Esav, stubble, and they will ignite them and consume them, etc." And it is written (Zechariah 12:6) "On that day I will make the chieftains of Judah like a stove — fire (burning) wood, torch (burning) sheaf, etc." All woods, when they burn, their sound is not heard; but stubble, when it burns, it crackles and is heard. Thus did the sound of Egypt, in its destruction, make itself heard. All woods, when they burn, leave a trace; but stubble, when it burns, leaves no trace. And the L rd said (Isaiah 43:17) "They (the chariots of Egypt) all lie together, never to rise, snuffed out like flax" — to teach that there was no kingdom so abject as that of Egypt, but it seized power for the moment towards the aggrandizement of Israel. When the (other) kingdoms are symbolized, they are symbolized as cedars, viz. (Ezekiel 31:3) "Behold, Ashur, a cedar in the Levanon," and (Amos 2:9) "And I destroyed the Emori from before them, whose height was as the height of cedars, etc.", and (Daniel 4:17) "The tree (Bavel) that you have seen, etc." And when Egypt is symbolized, it is symbolized only as stubble, viz. "He will consume them as stubble." And when the (other) kingdoms are symbolized, they are symbolized as silver and gold (Ibid. 2:32) "This statue, its head of fine gold, etc." And when Egypt is symbolized, it is symbolized only as lead, viz. (Exodus 15:10) "they sank as lead." And when the (other) kingdoms are symbolized, they are symbolized as beasts, viz. (Daniel 7:3) "and four immense beasts, etc." And when Egypt is symbolized, it is symbolized only as a fox, viz. (Song of Songs 2:15) "Seize for us the foxes, etc." Antoninus asked Rabbeinu Hakadosh: I want to go to Alexandria. Is it possible that a king will arise there who will beat me? He answered: I do not know. In any event, we have it in writing that Egypt is incapable of establishing either a king or a governor, viz. (Ezekiel 29:15) "Of all the kingdoms it (Egypt) will be the lowest, and it will not exalt itself again among the nations. And I will diminish them, so that they not dominate the nations."