Numbers 21:3-6

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

⁴And they journeyed from mount Hor by the way to the Red Sea, to compass the land of Edom; and the soul of the people became impatient because of the way.

⁵And the people spoke against God, and against Moses: 'Wherefore have ye brought us up out of Egypt to die in the wilderness? for there is no bread, and there is no water; and our soul loatheth this light bread.'

⁶And the LORD sent fiery serpents among the people, and they bit the people; and much people of Israel died.