'Minister' in the Bible
Then David said, “No one is to carry the ark of God but the Levites; for the Lord chose them to carry the ark of God and to minister to Him forever.”
So he left Asaph and his relatives there before the ark of the covenant of the Lord to minister before the ark continually, as every day’s work required;
The sons of Amram were Aaron and Moses. And Aaron was set apart to sanctify him as most holy, he and his sons forever, to burn incense before the Lord, to minister to Him and to bless in His name forever.
To these divisions of the gatekeepers, the chief men, were given duties like their relatives to minister in the house of the Lord.