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.
Berean Study Bible (BSB) - Isaiah 27:1 >In that day the LORD will take His sharp, great, and mighty sword, and bring judgment on Leviathan the fleeing serpent —Leviathan the coiling serpent—and He will slay the dragon of the sea.