'Serve' in the Bible

But if ye shall turn away from following me, ye or your children, and not keep my commandments and my statutes which I have set before you, but shall go and serve other gods, and worship them;

Thy father made our yoke grievous: now therefore make thou the grievous service of thy father, and his heavy yoke which he put upon us, lighter, and we will serve thee.

And they spake unto him, saying, If thou wilt be a servant unto this people this day, and wilt serve them, and answer them, and speak good words to them, then they will be thy servants for ever.