Numbers 33:37-41

37They moved from Kadesh and camped at Mount Hor, on the boundary of the land of Edom.

38Then Aaron the priest went up to Mount Hor at the command of the Lord, and died there in the fortieth year after the children of Israel had come out of the land of Egypt, on the first day of the fifth month.

39Aaron was one hundred and twenty-three years old when he died on Mount Hor.

40Now the king of Arad, the Canaanite, who dwelt in the South in the land of Canaan, heard of the coming of the children of Israel.

41So they departed from Mount Hor and camped at Zalmonah.