'Service' in the Bible

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

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

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