'Bond servant' in the Bible

For am I now seeking the favor of men, or of God? Or am I striving to please men? If I were still trying to please men, I would not be a bond-servant of Christ.

But I say that so long as the heir is a child, he differeth nothing from a bondservant though he is lord of all;

So that thou art no longer a bondservant, but a son; and if a son, then an heir through God.