Numbers 33:38-39

33:38 Aaron the priest ascended Mount Hor at the command ¹  of the Lord, and he died there in the fortieth year after the Israelites had come out of the land of Egypt on the first day of the fifth month. 33:39 Now Aaron was 123 years old when he died in Mount Hor.

[33:38]  ¹ tn Heb “mouth.”