Abdullah ibn al-Zubayr · The Chapters on Business Transactions

"When you have paid in advance for something, do not exchange it for something else." (Da'if)Another chain with similar wording.

"Sa'd, 'Ammar and I entered into a partnership on the day of Badr, (agreeing to share) whatever was allotted to us. 'Ammar and I did not get anything, but Sa'd got two men (slaves)."