'Servant' in the Bible

He has helped Israel his servant, in order to remember mercy,

and raised up a horn of deliverance for us in the house of David his servant;

Wherefore neither did I count myself worthy to come to thee. But say by a word and my servant shall be healed.

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