Partnership: Claiming the Loss of Partnership Capital
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 2164
If the partner who conducts transactions with the partnership capital says that the capital has perished, in the event that he is trusted by the other partners, they must accept his word. But if this is not the case, they can complain against him to a fully qualified jurist (al‑ḥākim al‑sharʿī) for the dispute to be settled in accordance with adjudication standards.
-Ayatullah Sistani, Practical Laws of Islam, Buying and Selling