Numbers 33:37-41

37They traveled from Kadesh and camped at Mount Hor on the edge of the land of Edom.

38At the Lord’s command, the priest Aaron climbed Mount Hor and died there on the first day of the fifth month in the fortieth year after the Israelites went out of the land of Egypt.

39Aaron was 123 years old when he died on Mount Hor.

40At that time the Canaanite king of Arad, who lived in the Negev in the land of Canaan, heard the Israelites were coming.

41They traveled from Mount Hor and camped at Zalmonah.