Numbers 33:37-42

They moved out from Kadesh and camped at Mount Hor, on the edge of the land of Edom. Aaron the priest went up on Mount Hor at the command of the LORD, and died there in the fortieth year after the Israelites came out of the land of Egypt, on the first day of the fifth month. [Num 20:23-29] Aaron was a hundred and twenty-three years old when he died on Mount Hor. The Canaanite king of Arad, who lived in the Negev (the South country) in the land of Canaan, heard that the sons of Israel were coming. They moved out from Mount Hor and camped at Zalmonah. Then they moved out from Zalmonah and camped at Punon.