And Yahweh said to Moses, "Make for yourself a snake and place it on a pole. When anyone is bitten and looks at it, that person will live." So Moses made a snake of bronze, and he placed it on the pole; whenever a snake bit someone, and that person looked at the snake of bronze, he lived.

They set out from Mount Hor [by] the way of the {Red Sea} to go around the land of Edom; but {the people became impatient} along the way. The people spoke against God and against Moses, "Why have you brought us from Egypt to die in the desert? There is no food and no water, and our hearts detest [this] miserable food." And Yahweh sent among the people poisonous snakes; they bit the people, and many people from Israel died.read more.
The people came to Moses and said, "We have sinned because we have spoken against Yahweh and against you. Pray to Yahweh and let him remove the snakes from among us." So Moses prayed for the people.

He removed the high places, and he smashed the stone pillars; he cut down the poles of Asherah worship and demolished the bronze serpent which Moses had made, for up to those days the {Israelites} were offering incense to it and called it Nehushtan.

And just as Moses lifted up the snake in the wilderness, thus it is necessary [that] the Son of Man be lifted up, so that everyone who believes in him will have eternal life."