Numbers 21:6

3 And Jehovah listened to the voice of Israel, and delivered up the Canaanites; and they utterly destroyed them, and their cities. And they called the name of the place Hormah.

4 And they journeyed from mount Hor by the way of the Red sea, to go round the land of Edom; and the soul of the people became impatient on the way;

5 and the people spoke against God, and against Moses, Why have ye brought us up out of Egypt that we should die in the wilderness? for there is no bread, and no water, and our soul loathes this light bread.

6 Then Jehovah sent fiery serpents among the people, which bit the people; and much people of Israel died.

7 And the people came to Moses and said, We have sinned, in that we have spoken against Jehovah, and against thee: pray to Jehovah that he take away the serpents from us. And Moses prayed for the people.

8 And Jehovah said to Moses, Make thee a fiery [serpent], and set it upon a pole; and it shall come to pass, that every one that is bitten, and looketh upon it, shall live.

9 And Moses made a serpent of brass, and put it upon a pole; and it came to pass, if a serpent had bitten any man, and he beheld the serpent of brass, he lived.