Numbers 33:37-42

They left Kadesh and camped at Mount Hor, at the border of Edom. While they were at the foot of Mount Hor, Aaron the priest was directed by the LORD to go up the mountain, and there he died. This happened in midsummer, on the first day of the fifth month of the fortieth year after Israel’s departure from Egypt. Aaron was 123 years old when he died there on Mount Hor. At that time the Canaanite king of Arad, who lived in the Negev in the land of Canaan, heard that the people of Israel were approaching his land. Meanwhile, the Israelites left Mount Hor and camped at Zalmonah. Then they left Zalmonah and camped at Punon.