'Priestly' in the Bible

You are to appoint Aaron and his sons to carry out their priestly responsibilities, but any unauthorized person who comes near the sanctuary must be put to death.”

The priestly sons of Aaron, moreover, shall blow the trumpets; and this shall be for you a perpetual statute throughout your generations.

But you and your sons will carry out your priestly responsibilities for everything concerning the altar and for what is inside the veil, and you will do that work. I am giving you the work of the priesthood as a gift, but an unauthorized person who comes near the sanctuary will be put to death.”

The Lord spoke to Aaron, "See, I have given you the responsibility for my raised offerings; I have given all the holy things of the Israelites to you as your priestly portion and to your sons as a perpetual ordinance.

Remove Aaron's priestly garments and put them on Eleazar his son, and Aaron will be gathered to his ancestors and will die there."

After Moses stripped Aaron of his [priestly] garments and put them on Eleazar his son, Aaron died there on the mountain top. Then Moses and Eleazar came down from the mountain.