Numbers 33:38
“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 they removed from Ezion–gaber, and pitched in the wilderness of Zin, which is Kadesh.
And they removed from Kadesh, and pitched in mount Hor, in the edge of the land of Edom.
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 was an hundred and twenty and three years old when he died in mount Hor.
And king Arad the Canaanite, which dwelt in the south in the land of Canaan, heard of the coming of the children of Israel.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And the children of Israel took their journey from Beeroth of the children of Jaakan to Mosera: there Aaron died, and there he was buried; and Eleazar his son ministered in the priest’s office in his stead.”
“And it came to pass in the fortieth year, in the eleventh month, on the first day of the month, that Moses spake unto the children of Israel, according unto all that the Lord had given him in commandment unto them;”
“Take Aaron and Eleazar his son, and bring them up unto mount Hor:”
“And Moses stripped Aaron of his garments, and put them upon Eleazar his son; and Aaron died there in the top of the mount: and Moses and Eleazar came down from the mount.”
“And when thou hast seen it, thou also shalt be gathered unto thy people, as Aaron thy brother was gathered.”