'Service' in the Bible

Are not all angels spirits that serve Him--whom He sends out to render service for the benefit of those who, before long, will inherit salvation?

because he deemed the reproaches which he might meet with in the service of the Christ to be greater riches than all the treasures of Egypt; for he fixed his gaze on the coming reward.

Therefore, receiving, as we now do, a kingdom which cannot be shaken, let us cherish thankfulness so that we may ever offer to God an acceptable service, with godly reverence and awe.