'Service of God' in the Bible
But their duty should be to wait on [the priests] the sons of Aaron in the service of the house of the Lord, caring for the courts, the chambers, the cleansing of all holy things, and any work of the service of God's house,
All these men were under their own fathers' authority for the music in the Lord's temple, with cymbals, harps, and lyres for the service of God's temple. Asaph, Jeduthun, and Heman were under the king's authority.
And see, [you have] the divisions of the priests and Levites for all the service of God's house, and with you in all the kinds of work will be every willing, skillful man for any kind of service. Also the officers and all the people will be wholly at your command.