John Gills Exposition of the Bible Commentary - John 3:14
And as Moses lifted up the serpent in the wilderness ,.... The history referred to is in Numbers 21:8 . There is, in many things, an agreement between this serpent, and Jesus Christ: as in the matter of it, it was a brazen serpent; it was made not of gold, nor of silver, but of brass, the meaner metal, and was a very unlikely means, of itself, to heal the Israelites; and might be despised by many: this may denote the meanness of Christ in his human nature, in his birth and parentage, and... read more
William Barclay's Daily Study Bible - John 3:14-15
3:14-15 And as Moses lifted up the serpent in the wilderness, so the Son of Man must be lifted up, that every one who believes in him may have eternal life. John goes back to a strange Old Testament story which is told in Numbers 21:4-9 . On their journey through the wilderness the people of Israel murmured and complained and regretted that they had ever left Egypt. To punish them God sent a plague of deadly, fiery serpents; the people repented and cried for mercy. God instructed Moses... read more