Take Aaron and Eleazar his son, and bring them up unto mount Hor:
Numbers 33:38
And Aaron the priest went up Mount Hor at the command of the LORD, and died there, in the fortieth year after the people of Israel had come out of the land of Egypt, on the first day of the fifth month.
Numbers 33:39
And Aaron was a hundred and twenty-three years old when he died on Mount Hor.