Sahih Muslim Book 27, Hadith Number 5593.
Chapter : The proper use of the words: Bondman, Slave-girl, Al-Maula and As-Sayyid.
This hadith has been reported on the authority of al-A’mash with the same chain of transmitters, and the words are that the servant should not say to his chief: My Lord, and Abu Mu’awiya made an addition: “For it is Allah, the Exalted and Glorious, Who is your Lord.”