Numbers 33:37-42

And they set out from Kadesh and camped at Mount Hor, on the edge of the land of Edom. And Aaron the priest went up Mount Hor at the command of the LORD and died there, in the fortieth year after the people of Israel had come out of the land of Egypt, on the first day of the fifth month. And Aaron was 123 years old when he died on Mount Hor. And the Canaanite, the king of Arad, who lived in the Negeb in the land of Canaan, heard of the coming of the people of Israel. And they set out from Mount Hor and camped at Zalmonah. And they set out from Zalmonah and camped at Punon.