Commercial Transactions (Kitab Al-Buyu)
Dawud :: Book 22 : Hadith 3331
Narrated AbuSafwan ibn Umayrah:
(The tradition mentioned above (No. 3330) has also been transmitted by AbuSafwan ibn Umayrah through a different chain of narrators.)
This version has: AbuSafwan said: I came to the Apostle of Allah (peace_be_upon_him) at Mecca before his immigration. He then narrated the rest of the tradition, but he did not mention the words "who was weighing for payment".