'Services' in the Bible

because the descendants of Levi left their pasture lands and their property to live in Judah and Jerusalem, since Jeroboam and his sons had excluded them from participating in priestly services to the LORD.

He also hired 100,000 elite forces from Israel, paying 100 talents of silver for their services.

Because there weren't enough priests, they were unable to prepare all the burnt offerings until other priests came forward after having consecrated themselves, so their descendant of Levi relatives assisted them until the services were complete. (The descendants of Levi had been more conscientious in consecrating themselves than had been the priests.)