John Trapp on Job 40:19

Verſe 19. He is the chief of the wayes of God] i.e. The Maſter-piece among all the beaſts (and perhaps firſt made) as Man is among all earthly creatures, being divini ingenii cura; as One calls him. Of all earthly irrational creatures, the Elephant is the hugeſt and ſtrongeſt and of moſt underſtanding.

He that made him can make his ſword to approach unto him] i.e. God alone can deal with him, and kill him. for no man dare undertake him unleſſe it be by Art and cunning; and that in Jobs dayes, likely, was not yet known or practiced. And if God had not given an horn to the Rhinoceros, and poiſon to the Dragon (who are the Elephants moſt mortal enemies) there were no beaſts to be found that could have the better of him. He is of himſelf long-lived, ſaith Ariſtotle. but God can, and doth cut him off at his pleaſure; and ſo he will thoſe maſterleſſe Monſters that perſecute his people, though they may ſeem to be out of the reach of his rod. Some read the words thus, He that made him, made his ſword to be near him; and intepret it of his Proboſcis, or Snout, wherewith, as with a ſword, he fights, and does many feats. Curtius ſaith, That when Porus the Indian King, being wounded in battle, fell down armed to the ground, his Elephant with his Trunk gently took him up, and ſet him upon his back again. Some in their wars have faſtned ſharp ſwords to the Snouts of the Elephants, and done much miſchief therewith to the enemy.