Numbers 33:38

And Aaron the priest ascended onto mount Hor, by the order of the Lord. And there he died, in the fortieth year of the departure of the sons of Israel from Egypt, in the fifth month, on the first day of the month

Other versions

King James Version

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.

English Standard Version

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.

New International Version

At the LORD's command Aaron the priest went up Mount Hor, where he died on the first day of the fifth month of the fortieth year after the Israelites came out of Egypt.