Numbers 33:37-39

Amplified Bible, Classic Edition

³⁷ And they removed from Kadesh and encamped at Mount Hor, on the edge of Edom.

³⁸ Aaron the priest went up on Mount Hor at the command of the Lord, and died there in the fortieth year after the Israelites came out of Egypt, the first day of the fifth month.^(A)

³⁹ Aaron was 123 years old when he died on Mount Hor.