Arabic text
عن عبد الله بن عمرو رضي الله عنهما قال: لَمْ يَكُنِ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ فَاحِشًا وَلَا مُتَفَحِّشًا، وَكَانَ يَقُولُ: «إِنَّ مِنْ خِيَارِكُمْ أَحْسَنَكُمْ أَخْلَاقًا».
Translation
‘Abdullāh ibn ‘Amr (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) was neither obscene, nor would he use obscene language, and he used to say: "Verily, the best of you are those who have the best manners."
Explanation
It was not part of the Prophet's character to speak or act indecently, nor would he deliberately do that. Indeed, he was of exemplary good character. The Prophet (may Allah's peace and blessings be upon him) used to say: The best among you in the sight of Allah are those who possess the best manners; in doing good, having a smiling face, refraining from harming others and bearing harm from them, and associating with people in a pleasant manner.
Source: HadeethEnc.com