Numbers 21:8

8.Make thee a fiery serpent. Nothing would, at first sight, appear more unreasonable than that a brazen serpent should be made, the sight of which should extirpate the deadly poison; but this apparent absurdity was far better suited to render the grace of God conspicuous than as if there had been anything natural in the remedy. If the serpents had been immediately removed, they would have deemed it to be an accidental occurrence, and that the evil had vanished by natural means. If, in the aid afforded, anything had been applied, bearing an affinity to fit and appropriate remedies, then also the power and goodness of God would have been thrown into the shade. In order, therefore, that they might perceive themselves to be rescued from death by the mere grace of God alone, a mode of preservation was chosen so discordant with human reason, as to be almost a subject for laughter. At the same time it had the effect of trying the obedience of the people, to prescribe a mode of seeking preservation, whichbrought all their senses into subjection and captivity. It was a foolish thing to turn the eyes to a serpent of brass, to prevent the ill effects of a poisonous bite; for what, according to man’s judgment, could a lifeless statue, lifted up on high, profit? But it is the peculiar virtue of faith, that we should willingly be fools, in order that we may learn to be wise only from the mouth of God. This afterwards more clearly appeared in the substance of this type: for, when Christ compares Himself to this serpent which Moses lifted up in the wilderness, (John 3:14,) it was not a mere common similitude which He employs, but He teaches us, that what had been shewn forth in this dark shadow, was completed in Himself. And, surely, unless the brazen serpent had been a symbol of spiritual grace, it would not have been laid up like a precious treasure, and diligently preserved for many ages in God’s sanctuary. The analogy, also, is very perfect; since Christ, in order to rescue us from death, put on our flesh, not, indeed, subject to sin, but representing “the likeness of sinful flesh,” as Paul says. (Romans 8:3.) hence follows, what I have above adverted to, that since “the world by wisdom knew not God,” He was manifested in the foolishness of the cross. (1 Corinthians 1:21.) If, then, we desire to obtain salvation, let us not be ashamed to seek it from the curse of Christ, which was typified in the image of the serpent.

Its lifting up is poorly and incorrectly, in my opinion, explained by some, as foreshadowing the crucifixion, (122) whereas it ought rather to be referred to the preaching of the Gospel: for Moses was commanded to set up the serpent on high, that it might be conspicuous on every side. And the word נס nes, is used both for a standard, and the mast of a ship, or any other high pole: which is in accordance with the prophecy of Isaiah, where he says that Christ should be “for an ensign” to all nations, (Isaiah 11:10) which we know to have been the case, by the spreading of the doctrine of the Gospel through the whole world, with which the look of faith corresponds. For, just as no healing was conveyed from the serpent to any who did not turn their eyes towards it, when set up on high, so the look of faith only causes the death of Christ to bring salvation to us. Although, therefore, God would give relief to their actual distress, it is still unquestionable that He even then admonished all believers that the venomous bites of the devil could only be cured by their directing their minds and senses by faith on Christ.

The brazen serpent is, furthermore, a proof to us how inclined to superstition the human race is, since posterity worshipped it as an idol, until it was reduced to powder by the holy king Hezekiah. (1 Kings 18:4.)