Numbers 33:39

39 And Aaron was a hundred and twenty-three years old, when he died in mount Or.

Numbers 33:39 In-Context

37 And they departed from Cades, and encamped in mount Or near the land of Edom.
38 And Aaron the priest went up by the command of the Lord, and died there in the fortieth year of the departure of the children of Israel from the land of Egypt, in the fifth month, on the first of the month.
39 And Aaron was a hundred and twenty-three years old, when he died in mount Or.
40 And Arad the Chananitish king (he too dwelt in the land of Chanaan) having heard when the children of Israel were entering —
41 then they departed from mount Or, and encamped in Selmona.

The Brenton translation of the Septuagint is in the public domain.