'Ministering' in the Bible

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

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