Numbers 33:38 (KJV)
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
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