'Serve' 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?

and serve a copy and type of the heavenly things, just as Moses was divinely instructed when about to build the tabernacle. For God said, "See that you make everything in imitation of the pattern shown you on the mountain."

how much more certainly shall the blood of Christ, who strengthened by the eternal Spirit offered Himself to God, free from blemish, purify your consciences from lifeless works for you to serve the ever-living God?