'Abdullah bin 'Abbas (رضي الله عنه) said:
Whilst the Messenger of Allah (ﷺ) was sitting in the courtyard of his house in Makkah, 'Uthman bin Maz'oon passed by him and smiled at the Messenger of Allah (ﷺ). The Messenger of Allah (ﷺ) said to him: "Why don't you sit down?” He said: Yes (I will). The Messenger of Allah (ﷺ) sat opposite him and whilst he was speaking to him, the Messenger of Allah (ﷺ) lifted his gaze up and looked at the sky for a while, Then he lowered his gaze and looked to the ground at his right. Then the Messenger of Allah (ﷺ) shifted his position, turning away from 'Uthman towards the spot at which he had lowered his gaze, and he started shaking his head as it he was trying to understand something that was being said to him, whilst Ibn Maz'oon was looking on. When he had finished and understood what was said to him, the Messenger of Allah (ﷺ) looked up at the sky as he had done the first time, following something with his gaze until it disappeared in the sky. Then he turned towards 'Uthman and sat as he had been sitting originally. He said: O Muhammad, I have sat and talked to you before, but I have never seen you doing what you did just now. He said: "What did you see me doing?” He said: I saw you lifting your gaze to the sky, then lowering it until you were looking to your right. Then you shifted position and turned away from me. Then you started to shake your head as if you were trying to understand something that was being said to you. He said: "Did you notice that?" 'Uthman said: Yes. The Messenger of Allah said: "A messenger from Allah came to me just now whilst you are sitting here." He said: A messenger from Allah? He said: "Yes." He said: What did he say to you? He said: “Verily, Allah enjoins Al-'Adl (i.e. justice and worshipping none but Allah Alone - Islamic Monotheism) and AI-Ihsan [i.e. to be patient in performing your duties to Allah, totally for Allah's sake and in accordance with the Sunnah (legal ways) of the Prophet (ﷺ) in a perfect manner), and giving (help) to kith and kin (i.e. all that Allah has ordered you to give them, e.g., wealth, visiting, looking after them, or any other kind of help), and forbids Al-Fahshah’ (i.e. all evil deeds, e.g. illegal sexual acts, disobedience of parents, polytheism, to tell lies, to give false witness, to kill a life without right), and Al-Munkar (ie, all that is prohibited by Islamic law: polytheism of every kind, disbelief and every kind of evil deeds), and Al-Baghy (ie, all kinds of oppression). He admonishes you, that you may take heed” [an-Nahl 16:90]. 'Uthman said. That was when the faith took hold in my heart and I began to love Muhammad.