Abu Hurayrah (may Allah be pleased with him) narrated from the Messenger of Allah (peace and blessings be upon him): "None of you should say: 'Give your lord to drink, feed your lord,' or 'help your lord with ablution'; nor should he say: 'My lord'; rather let him say: 'My master, my patron.' And none of you should say: 'My slave (abdi), my slave-woman (amati)'; rather let him say: 'My lad, my young man, my girl, my boy-servant.'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15812