Musnad Ahmad 1134:1

Yazid ibn Harun narrated to us, Shu'bah narrated to us, from Simak ibn Harb, who said: I heard Abu Safwan Malik ibn 'Umayr al-Asadi—Muhammad ibn Ja'far said: 'Umayrah—saying: "I arrived in Makkah before the Messenger of Allah, peace and blessings of Allah be upon him, had migrated. A man bought trousers from me, and he gave me extra weight [in payment]."