The Bronze Serpent
Numbers 21, look and live, as the early church read it
Bitten by venomous serpents in the wilderness and dying, Israel is given a strange remedy: Moses lifts a serpent of bronze on a pole, and whoever looks at it lives. No medicine, no work, just a look of faith at the lifted-up sign. Jesus Himself supplied the meaning: "As Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: that whosoever believeth in him should not perish, but have eternal life" (John 3:14-15). The early church, following Him, read the bronze serpent as a picture of the crucifixion, the lifted-up Savior at whom the dying look and are healed. The Epistle of Barnabas and Justin Martyr in their own words below, with a plain restatement.
The Fathers' words are verbatim and attributed (the Epistle of Barnabas and Justin Martyr, in the Ante-Nicene Fathers, public domain; selected from the running prose, footnote apparatus omitted). The box marked "In plain terms" is our own restatement, never the Fathers' words.
Numbers 21:8 · KJVAnd the LORD said unto Moses, Make thee a fiery serpent, and set it upon a pole: and it shall come to pass, that every one that is bitten, when he looketh upon it, shall live.
"Moses then makes a brazen serpent, and places it upon a beam… And Moses spake unto them, saying, 'When any one of you is bitten, let him come to the serpent placed on the pole; and let him hope and believe, that even though dead, it is able to give him life, and immediately he shall be restored.' And they did so. Thou hast in this also an indication of the glory of Jesus; for in Him and to Him are all things."
Epistle of BarnabasBarnabas, near the close of the apostolic age, reads the cure as a rehearsal of the gospel: the remedy is not effort but a look that "hopes and believes." The lifted-up sign "is able to give life" to the dying, and the early church saw in it "the glory of Jesus," the lifted-up Christ at whom faith looks and lives. The healing was never in the bronze; it was in the God who told them where to look.
Numbers 21:9 · KJV · with John 3:14And Moses made a serpent of brass, and put it upon a pole… when he beheld the serpent of brass, he lived. — "And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up."
"He proclaimed the mystery, by which He declared that He would break the power of the serpent which occasioned the transgression of Adam, and would bring to them that believe on Him, i.e., Him who was to be crucified, salvation from the fangs of the serpent… even so, though a curse lies in the law against persons who are crucified, yet no curse lies on the Christ of God, by whom all that have committed things worthy of a curse are saved."
Justin MartyrJustin draws out the deeper paradox. The thing lifted up looks like the very serpent that is killing them, and Christ lifted up looks like a cursed criminal ("cursed is every one that hangeth on a tree," Galatians 3:13). Yet just as the bronze serpent carried the image of the curse but none of its venom, so Christ bore the curse for us while remaining "free from unrighteousness." The lifted-up One who looks condemned is the One who "breaks the power of the serpent" that struck Adam, and saves all who look to Him in faith. The cure for the serpent's bite is to look at the Serpent-crusher lifted high.
Where this stands among the traditions
This is about as settled as interpretation gets, because the Lord Jesus gave the reading Himself in John 3, and the whole church, Catholic, Orthodox, and Protestant, follows Him: the bronze serpent lifted up is a type of Christ crucified, and the look of faith that healed the dying Israelite is the faith that saves the sinner. Two cautions sit at the edges. The first is a warning Scripture itself records: the bronze serpent was later kept and worshiped as an idol called Nehushtan, until King Hezekiah broke it in pieces (2 Kings 18:4). The God-given sign became a false god the moment people looked at it instead of through it to the Lord, a lasting caution that even a true symbol can be turned into an idol; the pointer is not the destination. The second is the modern critical move that reduces the episode to folklore or sympathetic magic, emptying it of the meaning Jesus assigned. The drift to resist runs both ways: do not strip the type the Lord Himself affirmed, and do not venerate the sign in place of the Savior it foreshadows. Look, and live. (See the serpent and the seed, born again, and the triumph of the cross.)
Patristic text from the Epistle of Barnabas (ch. 12) and Justin Martyr, Dialogue with Trypho (ch. 94), in the Ante-Nicene Fathers (public domain), selected from the running prose with footnote apparatus omitted; nothing added or paraphrased within the quotation marks. Scripture in the King James Version; the plain-language lines are our own restatement. This passage in the Study Bible; Numbers 21 at BibleHub.