'Minister' in the Bible

as well as the firstborn of our sons and of our cattle, as is written in the Law, and the firstborn of our herds and flocks, to bring to the house of our God, for the priests who minister in the house of our God.

For the Israelites and the sons of Levi shall bring the offering of the grain, the new wine, and the oil to the chambers; the utensils of the sanctuary, the priests who are ministering, the gatekeepers, and the singers are there. In this manner, we will not neglect the house of our God.