Numbers 21:5-8

so the people complained against God and Moses, “Why have you brought us up from Egypt to die in the wilderness, where there is no food or water? We are disgusted with this wretched food!” So the LORD sent among the people seraph serpents, which bit the people so that many of the Israelites died. Then the people came to Moses and said, “We have sinned in complaining against the LORD and you. Pray to the LORD to take the serpents from us.” So Moses prayed for the people, and the LORD said to Moses: Make a seraph and mount it on a pole, and everyone who has been bitten will look at it and recover.