'Minister' in the Bible

also the firstborn of our sons, and of our livestock, as it is written in the law, and the firstborn of our herds and of our flocks, to bring to the house of our God, to the priests who minister in the house of our God;

For the children of Israel and the children of Levi shall bring the wave offering of the grain, of the new wine, and of the oil, to the rooms, where are the vessels of the sanctuary, and the priests who minister, and the porters, and the singers. We will not forsake the house of our God.