Abu Safwan bin Amirah (may Allah be pleased with him) said: I came to the Messenger of Allah (peace and blessings be upon him) in Makkah before the Hijrah and sold him cloth for a pair of trousers. He (peace and blessings be upon him) paid me its full price and gave me extra as well.
Abu Dawud said: Qays narrated it as Sufyan said, and the correct view is that of Sufyan. Shu'bah said: Sufyan had a better memory than me.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11172