'Minister' in the Bible

Then David said, “No one but the Levites may carry the ark of God, because the Lord has chosen them to carry the ark of the Lord and to minister before Him forever.”

So David left Asaph and his relatives there before the ark of the Lord’s covenant to minister regularly before the ark according to the daily requirements.

Amram’s sons: Aaron and Moses.Aaron, along with his descendants, was set apart forever to consecrate the most holy things, to burn incense in the presence of Yahweh, to minister to Him, and to pronounce blessings in His name forever.