'Ministering' in the Bible

and the firstlings of our sons, and of our cattle, as it is written in the law, and the firstlings of our herds and our flocks, to bring in to the house of our God, to the priests who are ministering in the house of our God.

for unto the chambers do they bring in -- the sons of Israel and the sons of Levi -- the heave-offering of the corn, the new wine, and the oil, and there are vessels of the sanctuary, and the priests, those ministering, and the gatekeepers, and the singers, and we do not forsake the house of our God.