A favorite picture concerning the topic of serpent/dragon
In that day, the LORD will punish with his sword -- his fierce, great and powerful sword -- Leviathan the gliding serpent, Leviathan the coiling serpent; he will slay the monster of the sea.
I looked, and behold, a white horse, and he who sat on it had a bow; and a crown was given to him, and he went out conquering and to conquer.
11 Now I saw heaven opened, and behold, a white horse. And He who sat on him was called Faithful and True, and in righteousness He judges and makes war. 12 His eyes were like a flame of fire, and on His head were many crowns. He had[a] a name written that no one knew except Himself. 13 He was clothed with a robe dipped in blood, and His name is called The Word of God. 14 And the armies in heaven, clothed in fine linen, white and clean,[b] followed Him on white horses. 15 Now out of His mouth goes a sharp[c] sword, that with it He should strike the nations. And He Himself will rule them with a rod of iron. He Himself treads the winepress of the fierceness and wrath of Almighty God. 16 And He has on His robe and on His thigh a name written: KING OF KINGS AND LORD OF LORDS.