Mishkat al-Masabih 29 Excellent Qualities and Description of the Prophet كتاب الفضائل والشمائل 61

عَنْ أَنَسٍ قَالَ: خَدَمْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَشْرَ سِنِينَ فَمَا قَالَ لِي: أُفٍّ وَلَا: لِمَ صَنَعْتَ؟ وَلَا: أَلَّا صَنَعْتَ؟ مُتَّفق عَلَيْهِ

Anas said: I served the Prophet for ten years, and he never said to me, “Shame!” or “Why did you do such and such?” or “Why did you not do such and such?” (Bukhari And Muslim.)