Numbers 21:8

Make thee a fiery serpent - Literally, make thee a seraph.

And put it upon a pole - על נס al nes, upon a standard or ensign.

Make thee a fiery serpent - i. e. a serpent resembling in appearance the reptiles which attacked the people. The resemblance was of the essence of the symbolism (compare 1 Samuel 6:5). As the brass serpent represented the instrument of their chastisement, so the looking unto it at God's word denoted acknowledgment of their sin, longing for deliverance from its penalty, and faith in the means appointed by God for healing. In the serpent of brass, harmless itself, but made in the image of the creature that is accursed above others Genesis 3:14, the Christian fathers rightly see a figure of Him John 3:14-15 who though "holy, harmless, undefiled, separate from sinners" Hebrews 7:26, was yet "made sin" 2 Corinthians 5:21, and "made a curse for us" Galatians 3:13. And the eye of faith fixed on Him beholds the manifestation at once of the deserts of sin, of its punishment imminent and deprecated, and of the method of its remission devised by God Himself.

21:8 A fiery serpent - That is, the figure of a serpent in brass, which is of a fiery colour. This would require some time: God would not speedily take off the judgment, because he saw they were not throughly humbled.Upon a pole - That the people might see it from all parts of the camp, and therefore the pole must be high, and the serpent large. When he looketh - This method of cure was prescribed, that it might appear to be God's ownwork, and not the effect of nature or art: and that it might be an eminent type of our salvation by Christ. The serpent signified Christ, who was in the likeness of sinful flesh, though without sin, as this brazen serpent had the outward shape, but not the inward poison, of the other serpents: the pole resembled the cross upon which Christ was lifted up for our salvation: and looking up to it designed our believing in Christ.