It was narrated that Muhammad said: "I do not know that Shuraih ever ruled on Mudarabah disputes except in two ways. He would say to the Mudarib (the one who contributed his labor to the partnership): 'You must provide proof that a calamity befell you so that you may be excused.' Or he would say to the one who invested his money in the partnership: 'You must provide proof that your trustee betrayed his trust, otherwise his oath sworn by Allah that he did not betray you is sufficient.'"

Source: sunnah.com · Version: urn:1039500

It was narrated that 'Abdullah said: "I formed a partnership with 'Ammar and Sa'd on the day of Badr. Sa'd brought two prisoners but 'Ammar and I did not bring anything."

Source: sunnah.com · Version: urn:1039520

It was narrated from Az-Zuhri concerning two slaves who were partners, and one of them quit, that he said: "One of them may cover for the other if they were partners."

Source: sunnah.com · Version: urn:1039530