Numbers 33:38-39
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 were come out of the land of Egypt, in the first day of the fifth month.
39
And Aaron was an hundred and twenty and three years old when he died in mount Hor.
Bible text: King James Version (1769 Blayney text) · Public domain