'Ministering' in the Bible

Yet they shall be ministers in My sanctuary, having oversight at the gates of the house and ministering in the house; they shall slaughter the burnt offering and the sacrifice for the people, and they shall stand before them to minister to them.

It shall be that when they enter at the gates of the inner court, they shall be clothed with linen garments; and wool shall not be on them while they are ministering in the gates of the inner court and in the house.

When they go out into the outer court, into the outer court to the people, they shall put off their garments in which they have been ministering and lay them in the holy chambers; then they shall put on other garments so that they will not transmit holiness to the people with their garments.