'Serve' in the Bible

But if you turn away from following me, you 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;

"Your father made our yoke grievous: now therefore make you the grievous service of your father, and his heavy yoke which he put on us, lighter, and we will serve you."

They spoke to him, saying, "If you will be a servant to this people this day, and will serve them, and answer them, and speak good words to them, then they will be your servants forever."