40. The Book Concerning the Use of Correct Words - كتاب الألفاظ من الأدب وغيرها
3) Chapter: Ruling On Using The Words 'Abd And Amah (For Slaves) And Mawla And Sayyid (For Masters)
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.