General Behavior (Kitab Al-Adab) · The slave should not say Rabbi or Rabbati (My lord, My lady)
Arabic
حَدَّثَنَا ابْنُ السَّرْحِ، أَخْبَرَنَا ابْنُ وَهْبٍ، قَالَ أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ، أَنَّ أَبَا يُونُسَ، حَدَّثَهُ عَنْ أَبِي هُرَيْرَةَ، فِي هَذَا الْخَبَرِ وَلَمْ يَذْكُرِ النَّبِيَّ صلى الله عليه وسلم قَالَ " وَلْيَقُلْ سَيِّدِي وَمَوْلاَىَ " .
English translation
The tradition mentioned above has also been transmitted by Abu Hurairah through a different chain of narrators. This version does not mention the Prophet (May peace be upon him) i.e, it does not go back to him. It has : He must say: “My master” (sayyidi) and “My patron” (mawlaya).
Narrated AbuHurayrah:
The Prophet (ﷺ) said: None of you must say: "My slave" (abdi) and "My slave-woman" (amati), and a slave must not say: "My lord" (rabbi or rabbati). The master (of a slave) should say: "My young man…
Narrated Buraydah ibn al-Hasib:
The Prophet (ﷺ) said: Do not call a hypocrite sayyid (master), for if he is a sayyid, you will displease your Lord, Most High.