Abdullah bin Abbas reported,

The Messenger of Allah ﷺ was sitting in the courtyard of his house in Makkah when Uthman bin Mazun passed by and smiled at him.The Messenger of Allah ﷺ said to him, "Won't you sit down?""Certainly," he replied.So the Messenger of Allah ﷺ sat facing him. While he was talking with him, the Messenger of Allah ﷺ suddenly fixed his gaze upward at the sky. He looked at the sky for a while, then began to lower his gaze until it settled on the ground to his right. He turned away from his companion Uthman toward the place where his gaze had settled, and he began to nod his head as though he were trying to grasp what was being said to him, while Ibn Mazun watched. When the matter was finished and he had understood what was being said to him, the Messenger of Allah ﷺ fixed his gaze upward at the sky again as he had the first time, and followed it with his eyes until it disappeared into the sky. Then he turned back to Uthman, sitting as he had been at first.Uthman said, "Muhammad, in all the time I have sat with you and come to you, I have never seen you do anything like what you did this morning.""And what did you see me do?" he asked.Uthman said, "I saw you fix your gaze on the sky, then lower it to your right, and you turned toward it and left me, and you began to nod your head as though you were trying to grasp something being said to you.""You noticed that?" he asked."Yes," said Uthman.The Messenger of Allah ﷺ said, "A messenger of Allah came to me just now, while you were sitting here.""A messenger of Allah?" Uthman asked."Yes," he replied."And what did he say to you?"He said, "Allah commands justice, kindness, and giving to relatives, and He forbids indecency, wrongdoing, and oppression. He admonishes you so that you may take heed." [Nahl 16:90]Uthman said, "That was the moment faith settled in my heart, and I came to love Muhammad."

عن عبد الله بن عباس قال

بينما رسول الله ﷺ بفناء بيته بمكة جالس، إذ مر به عثمان بن مظعون، فكشر إلى رسول الله ﷺ، فقال له رسول الله ﷺ: ألا تجلس؟ قال: بلى. قال: فجلس رسول الله ﷺ مستقبله، فبينما هو يحدثه، إذ شخص رسول الله ﷺ ببصره إلى السماء، فنظر ساعة إلى السماء، فأخذ يضع بصره حتى وضعه على يمينه في الأرض، فتحرف رسول الله ﷺ عن جليسه عثمان إلى حيث وضع بصره، وأخذ ينغض رأسه، كأنه يستفقه ما يقال له، وابن مظعون ينظر، فلما قضى حاجته، واستفقه ما يقال له، شخص بصر رسول الله ﷺ إلى السماء كما شخص أول مرة، فأتبعه ببصره حتى توارى في السماء، فأقبل إلى عثمان بجلسته الأولى، قال: يا محمد فيم كنت أجالسك وآتيك، ما رأيتك تفعل كفعلك الغداة؟ قال: وما رأيتني فعلت؟ قال: رأيتك تشخص ببصرك إلى السماء، ثم وضعته حيث وضعته على يمينك، فتحرفت إليه وتركتني، فأخذت تنغض رأسك، كأنك تستفقه شيئا يقال لك. قال: وفطنت لذلك؟ قال عثمان: نعم. قال رسول الله ﷺ: أتاني رسول الله آنفا، وأنت جالس قال: رسول الله؟ قال: نعم. قال: فما قال لك؟ قال: {ان الله يامر بالعدل والاحسان وايتآئ ذي القربى وينهى عن الفحشآء والمنكر والبغي يعظكم لعلكم تذكرون} قال عثمان: فذلك حين استقر الإيمان في قلبي، وأحببت محمدا.