Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings of Allah be upon him) said: None of you should say to his slave, "Give water to your lord," or "Feed your lord," or "Make ablution for your lord," and none of you should call another "my lord." Rather, say "my master" or "my patron." And none of you should say "my slave" or "my slave-girl," but say "my young man" or "my young woman."