'Service' in the Bible

Are they not all ministering spirits, sent out for service on account of those who shall inherit salvation?

For he, of whom these things are said, belongs to a different tribe, of which no one has ever been attached to the service of the altar.

The first therefore also indeed had ordinances of service, and the sanctuary, a worldly one.

And the tabernacle too and all the vessels of service he sprinkled in like manner with blood;