The Messenger of Allah ﷺ said, "The people accepted Islam, but Amr bin As truly believed."
حدثنا قتيبة حدثنا ابن لهيعة عن مشرح بن هاعان
قال رسول الله ﷺ أسلم الناس وآمن عمرو بن العاص
[Its isnad is hasan]. Ahmad narrated it (4/155) from the hadith of Ibn Lahia through this route, and he explicitly stated that he heard it directly. Abu Abdul-Rahman al-Muqri, Abdullah bin Wahb, and others narrated from him. It has a hasan corroborating witness in Ahmad (2/354).