'Service of God' in the Bible

For their duty is to assist [the priests] the sons of Aaron in the service of the house of the Lord, in [caring for] the courtyards, the chambers, the purifying of all holy things, and any work of the service of the house of God,

And see, [you have] the divisions of the priests and Levites for all the service of God’s house, and every willing, skillful man will be with you in all the kinds of work for any kind of service. Also the officers and all the people will be entirely at your command.”