Numbers 21:8-10 World English Bible (WEB)
8 Yahweh said to Moses, “Make a venomous snake, and set it on a pole. It shall happen that everyone who is bitten, when he sees it, shall live.” 9 Moses made a serpent of bronze, and set it on the pole. If a serpent had bitten any man, when he looked at the serpent of bronze, he lived.
10 The children of Israel traveled, and encamped in Oboth.