Numbers 33:37-39

New King James Version

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

³⁸ Then ^(B)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. ³⁹ Aaron was one hundred and twenty-three years old when he died on Mount Hor.