'Minister' in the Bible

Then David said, None ought to carry the ark of God but the Levites: for them hath Jehovah chosen to carry the ark of God, and to minister unto him for ever.

And he appointed certain of the Levites to minister before the ark of Jehovah, and to celebrate and to thank and praise Jehovah, the God of Israel:

So he left there, before the ark of the covenant of Jehovah, Asaph and his brethren, to minister before the ark continually, as every day's work required;

The sons of Amram: Aaron and Moses; and Aaron was separated, that he should sanctify the most holy things, he and his sons, for ever, to burn incense before Jehovah, to minister unto him, and to bless in his name, for ever.

Of these were the courses of the doorkeepers, even of the chief men, having offices like their brethren, to minister in the house of Jehovah.