'Serve' in the Bible

Then says Jesus to him, Get thee away, Satan, for it is written, Thou shalt do homage to the Lord thy God, and him alone shalt thou serve.

No one can serve two masters; for either he will hate the one and will love the other, or he will hold to the one and despise the other. Ye cannot serve God and mammon.

as indeed the Son of man did not come to be served, but to serve, and to give his life a ransom for many.