'Service' in the Bible

And they set the priests in their classes, and the Levites in their divisions, for the service of God, which is at Jerusalem: as it is written in the book of Moses.

And the vessels that have been given thee for the service of the house of thy God, deliver before the God of Jerusalem.

and of the Nethinim, whom David and the princes had appointed for the service of the Levites, two hundred and twenty Nethinim: all of them were expressed by name.