Verses 13-15 “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.”
Not only Aaron and his sons, but also the ark, the table, the candlestick, the gold altar of incense, the brass altar of sacrifice, the laver, and the entire tabernacle were sanctified. Being sanctified means being set aside for God’s use. Especially must God’s people be sanctified, set aside from sin, if they would be useful to Him. There is no substitute for holiness. The Bible says, “For God hath not called us unto uncleanness, but unto holiness” (I Thess 4:7). This is what it means to be separated unto the Lord.