Num 21:4-9
The people became irritable and cross as they traveled. 5 They spoke out against God and Moses: "Why did you drag us out of Egypt to die in this godforsaken country? No decent food; no water — we can't stomach this stuff any longer."
6 So GOD sent poisonous snakes among the people; they bit them and many in Israel died. 7 The people came to Moses and said, "We sinned when we spoke out against GOD and you. Pray to GOD; ask him to take these snakes from us."
Moses prayed for the people.
8 GOD said to Moses, "Make a snake and put it on a flagpole: Whoever is bitten and looks at it will live."
9 So Moses made a snake of fiery copper and put it on top of a flagpole. Anyone bitten by a snake who then looked

Jesus is our snake of fiery copper on a flagpole.