Numbers 33:37-39

21st Century King James Version

³⁷ And they removed from Kadesh and pitched in Mount Hor, on the edge of the land of Edom.

³⁸ And Aaron the priest went up into Mount Hor at the commandment 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.

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