Anas bin Maalik Radiyallahu 'Anhu says:
"I remained in the service (of Rasulullah Sallallahu 'Alayhi Wasallam for ten years. He never once told me 'Oof'. When I did something, he never asked me, why did you do so? When I did not do a certain task, he never asked me why I did not do it. Rasulullah Sallallahu 'Alayhi Wasallam had the best character among all people. (and also possessed the most excellent features, so much so,) that I never felt a silk cloth, nor pure silk, nor any other thing softer than the palm of Rasulullah Sallallahu 'Alayhi Wasallam. Nor did I smell any musk or any other fragrance, more sweet smelling than the sweat of Rasulullah Sallallahu 'Alayhi Wasallam".
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ‏:‏ حَدَّثَنَا جَعْفَرُ بْنُ سُلَيْمَانَ الضُّبَعِيُّ، عَنْ ثَابِتٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ‏:‏ خَدَمْتُ رَسُولَ اللهِ صلى الله عليه وسلم عَشْرَ سِنِينَ، فَمَا قَالَ لِي أُفٍّ قَطُّ، وَمَا قَالَ لِشَيْءٍ صَنَعْتُهُ، لِمَ صَنَعْتَهُ، وَلا لِشَيْءٍ تَرَكْتُهُ، لِمَ تَرَكْتَهُ‏؟‏ وَكَانَ رَسُولُ اللهِ صلى الله عليه وسلم، مِنْ أَحْسَنِ النَّاسِ خُلُقًا، وَلا مَسَسْتُ خَزًّا وَلا حَرِيرًا، وَلا شَيْئًا كَانَ أَلْيَنَ مِنْ كَفِّ رَسُولِ اللهِ صلى الله عليه وسلم، وَلا شَمَمْتُ مِسْكًا قَطُّ، وَلا عِطْرًا كَانَ أَطْيَبَ مِنْ عَرَقِ رسول الله صلى الله عليه وسلم‏.‏
English reference : Book 47, Hadith 328
Arabic reference : Book 48, Hadith 345