Numbers 33:37-39

New International Version - UK

³⁷ They left Kadesh and camped at Mount Hor, on the border of Edom. ³⁸ At the Lord’s command Aaron the priest went up Mount Hor, where he died on the first day of the fifth month of the fortieth year after the Israelites came out of Egypt. ³⁹ Aaron was a hundred and twenty-three years old when he died on Mount Hor.