'Minister in the Sanctuary' in the Bible

and they shall take all the vessels of ministry, wherewith they minister in the sanctuary, and put them in a cloth of blue, and cover them with a covering of sealskin, and shall put them on the frame.

And in the day that he goeth into the sanctuary, into the inner court, to minister in the sanctuary, he shall offer his sin-offering, saith the Lord Jehovah.