From Sahih Bukhari (Hadith 2768):
Narrated Anas:When Allah's Messenger (ﷺ) came to Medina; he did not have any servant. Abu Talha (Anas' step-father) took me to Allah's Messenger (ﷺ) and said, "O Allah's Messenger (ﷺ)! Anas is a wise boy, so let him serve you." So, I served him at home and on journeys. If I did anything, he never asked me why I did it, and if I refrained from doing anything, he never asked me why I refrained from doing it
Reference: Bukhari 2768