Numbers 33:37-39

New Revised Standard Version, Anglicised Catholic Edition

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

³⁸ Aaron the priest went up Mount Hor at the command of the Lord and died there in the fortieth year after the Israelites 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.