(3) باب حُكْمِ إِطْلاَقِ لَفْظَةِ الْعَبْدِ وَالأَمَةِ وَالْمَوْلَى وَالسَّيِّدِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
None of you should say: My bondman, for all of you are the bondmen of Allah, but say: My young man, and the servant should not say: My Lord, but should say: My chief.
Reference: Sahih Muslim 2249 b
In-book reference: Book 40, Hadith 14
USC-MSA web (English) reference(deprecated numbering scheme): Book 27, Hadith 5592