'Servant' in the Bible

“He has given help to Israel His servant,In remembrance of His mercy,

And has raised up a horn of salvation for usIn the house of David His servant—

for this reason I did not even consider myself worthy to come to You, but just say the word, and my servant will be healed.

No servant can serve two masters; for either he will hate the one and love the other, or else he will be devoted to one and despise the other. You cannot serve God and wealth.”

But it is not this way with you, but the one who is the greatest among you must become like the youngest, and the leader like the servant.