Numbers 33:39 KJV
And Aaron was an hundred and twenty and three years old when he died in mount Hor.
Numbers 33:39, King James Version
In context
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.
40 And king Arad the Canaanite, which dwelt in the south in the land of Canaan, heard of the coming of the children of Israel.