isaiah 27:1 In that day the LORD with his sore and great and strong sword shall punish leviathan the piercing serpent, even leviathan that crooked serpent; and he shall slay the dragon that is in the sea. - Free Bible Online

      Isa 27:1-13. CONTINUATION OF THE TWENTY-FOURTH, TWENTY-FIFTH, AND TWENTY-SIXTH CHAPTERS.

      At the time when Israel shall be delivered, and the ungodly nations punished, God shall punish also the great enemy of the Church.

      1. sore--rather, "hard," "well-tempered."
      leviathan--literally, in Arabic, "the twisted animal," applicable to every great tenant of the waters, sea-serpents, crocodiles, &c. In Eze 29:3; 32:2; Da 7:1, &c. Re 12:3, &c., potentates hostile to Israel are similarly described; antitypically and ultimately Satan is intended (Re 20:10).
      piercing--rigid [LOWTH]. Flying [MAURER and Septuagint]. Long, extended, namely, as the crocodile which cannot readily bend back its body [HOUBIGANT].
      crooked--winding.
      dragon--Hebrew, tenin; the crocodile.
      sea--the Euphrates, or the expansion of it near Babylon.

JFB.