Rabia bin Abbad reported,

I saw the Messenger of Allah ﷺ with my own eyes in the market of Dhu al-Majaz, saying, "People, say there is no god but Allah and you will succeed." He was making his way through its lanes while the people were crowding around him. I did not see anyone saying anything to him, but he would not fall silent, repeating, "People, say there is no god but Allah and you will succeed." Yet behind him was a cross-eyed man with a bright face and two long braids who was saying, "He is an apostate and a liar."I asked, "Who is this?"They said, "Muhammad bin Abdullah, and he claims prophethood."I asked, "And who is this one calling him a liar?"They said, "His uncle, Abu Lahab."I said to him, "You must have been very young at the time."He replied, "No, by Allah, I was old enough to understand."

عن ربيعة بن عباد الديلي، وكان جاهليا أسلم فقال

رأيت رسول الله ﷺ بصر عيني بسوق ذي المجاز يقول: يا أيها الناس قولوا: لا إله إلا الله تفلحوا ويدخل في فجاجها. والناس متقصفون عليه. فما رأيت أحدا يقول شيئا وهو لا يسكت يقول: يا أيها الناس قولوا: لا إله إلا الله تفلحوا إلا أن وراءه رجلا أحول وضيء الوجه ذا غديرتين يقول: إنه صابئ كاذب. فقلت: من هذا؟ قالوا: محمد بن عبد الله وهو يذكر النبوة. قلت: من هذا الذي يكذبه؟ قالوا: عمه أبو لهب. قلت: إنك كنت يومئذ صغيرا. قال: لا والله إني يومئذ لأعقل.