Ali ibn Abi Talib, cousin to the prophet and one of the earliest caliphs of Islam, noted:
He was not vulgar nor did he condone vulgarity, and he was not one to shout in the market place. He did not reward evil with evil, rather, he would forgive and overlook. He never in his life struck anything with his hand except when he was fighting in the name of Allah. He never struck a servant nor a woman, and I never saw him taking revenge for an injustice dealt him, except if the prohibitions of Allah were transgressed. For if the prohibitions of Allah were transgressed he was among the strongest of them in anger. He was never given a choice between two matters but he chose the simplest of the two. If he entered into his home he was a man like any other, cleaning his own garment, milking his own goat, and serving himself.
He was continually smiling, gentle in manners, soft in nature. He was not severe, harsh-hearted, loud, abusive, or miserly. He would disregard that which he disliked, and no one ever despaired of him. He never responded to disparagement or evil words. He forbade himself three things: argument, arrogance, and that which did not concern him. And he relieved the people of three: He would not degrade any among them or abuse them, he would not search after their honor or private matters, and he would not speak except in matters which he hoped to be rewarded for. When he spoke his attendees would lower their heads as if birds had alighted upon them. Once he finished they would speak. They would not vie with one-another in his presence to speak, but when one would talk in his presence the rest would listen until he finished. Speech in his presence was that of the first among them. He would laugh with them, and wonder with them. He had patience with the strangers when they were gruff in speech and requests, to a degree that his companions would fetch them to him. He would say: “If you see someone in need, fetch him to me.” He would not accept praise except from those who were balanced and not excessive. He would not interject into someone’s speech unless they transgressed, in which case he would either rebuke them or else leave.
Mukhtasar Ash-Shama’el Al Muhammadiyyah by Imam At-Tirmithi, pg 18, hadith No. 6. Second paragraph also narrated by At-Tabarani in Al-Mu’jam Al-Kabeer.