What does Exodus 40:15 say in the KJV?

And thou shalt anoint them, as thou didst anoint their father, that they may minister unto me in the priest’s office: for their anointing shall surely be an everlasting priesthood throughout their generations.

Instructions given to Moses regarding the consecration of priests.

King James Version (public domain)

Traditionally attributed to Moses · c. 13th century BC · The Pentateuch — Genesis, Exodus, Leviticus, Numbers, and Deuteronomy — is traditionally attributed to him

Context

13And thou shalt put upon Aaron the holy garments, and anoint him, and sanctify him; that he may minister unto me in the priest’s office.

14And thou shalt bring his sons, and clothe them with coats:

15And thou shalt anoint them, as thou didst anoint their father, that they may minister unto me in the priest’s office: for their anointing shall surely be an everlasting priesthood throughout their generations.

16Thus did Moses: according to all that the LORD commanded him, so did he.

17And it came to pass in the first month in the second year, on the first day of the month, that the tabernacle was reared up.