The Prophet ﷺ said, "You should not say, 'Feed your lord (Rabbaka), help your lord in performing ablution, or give water to your lord, but should say, 'my master (e.g. Feed your master instead of lord etc.) (Saiyidi), or my guardian (Maulai), and one should not say, my slave (Abdi), or my girl-slave (Amati), but should say, my lad (Fatai), my lass (Fatati), and 'my boy (Ghulami).  

أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ ؓ يُحَدِّثُ عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ لاَ يَقُلْ أَحَدُكُمْ أَطْعِمْ رَبَّكَ وَضِّئْ رَبَّكَ اسْقِ رَبَّكَ وَلْيَقُلْ سَيِّدِي مَوْلاَىَ وَلاَ يَقُلْ أَحَدُكُمْ عَبْدِي أَمَتِي وَلْيَقُلْ فَتَاىَ وَفَتَاتِي وَغُلاَمِي  

None of you should say: Supply drink to your lord, feed your lord, help your lord in performing ablution, and none of you should say: My Lord. He should say: My chief, my patron; and none of you should say: My bondman, my slave-girl, but simply say: My boy, my girl, my servant. (Using translation from Muslim 2249d)   

وَقَالَ رَسُولُ اللهِ ﷺ لَا يَقُلْ أَحَدُكُمْ اسْقِ رَبَّكَ أَطْعِمْ رَبَّكَ وَضِّئْ رَبَّكَ وَلَا يَقُلْ أَحَدُكُمْ رَبِّي وَلْيَقُلْ سَيِّدِي وَمَوْلَايَ وَلَا يَقُلْ أَحَدُكُمْ عَبْدِي وَأَمَتِي وَلْيَقُلْ فَتَايَ فَتَاتِي وَغُلَامِي  

[Machine] And the Messenger of Allah ﷺ said, let none of you say, "Feed your Lord, my Lord and enlighten your Lord." And let none of you say, "My Lord," but let him say, "My Master, My Lord." And let none of you say, "My servant, My slave," but let him say, "My Boy, My Girl, My Youth."  

وَقَالَ رَسُولُ اللهِ ﷺ لَا يَقُلْ أَحَدُكُمْ اسْقِ رَبَّكَ أَطْعِمْ رَبَّكَ وَضِّئْ رَبَّكَ وَلَا يَقُلْ أَحَدُكُمْ رَبِّي وَلْيَقُلْ سَيِّدِي مَوْلَايَ وَلَا يَقُلْ أَحَدُكُمْ عَبْدِي أَمَتِي وَلْيَقُلْ فَتَايَ فَتَاتِي غُلَامِي  

"لا يَقُلْ أحَدُكُمْ: أطعِمْ ربَّكَ، وَضِّيءْ ربَّكَ، وأَسْق رَبَّكَ، وَلَا يَقُلْ أَحَدُكُمْ: ربِّي، وَلَيَقُلْ: سَيِّدي وَمَولاي، وَلَا يَقُلْ أَحَدُكُمْ: عَبدي، أَمَّتِي، وَليَقُل: فَتَاي وَفَتَاتِي وَغُلامِي".