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.

Jewish Publication Society of America Version (JPS1917) - Isaiah 27:1 >

In that day the LORD with His sore and great and strong sword will punish leviathan the slant serpent, and leviathan the tortuous serpent; and He will slay the dragon that is in the sea.