Muwatta Malik: Book 32, Hadith 13

Yahya said that Malik spoke about an investor who gave qirad money to a man, and then the man sought a loan from the investor or the investor borrowed money from the agent, or the investor left goods with the agent to sell for him, or the investor gave the agent dinars to buy goods with. Malik said, “There is no harm if the investor leaves his goods with him knowing that if the agent did not have his money and he had asked a similar thing of him, he would have still done it because of the brotherhood between them or because it would have been no bother to him and that had the agent refused that, he would not have removed his capital from him. Or if the agent had borrowed from the investor or carried his goods for him and he knew that if the investor had not had his capital with him, he would have still done the same for him, and had he refused that to him, he would not have returned his capital to him. If that is true between both of them and it is in the way of a favour between them and it is not a condition in the terms of the qirad, it is permitted and there is no harm in it. If a condition comes into it, or it is feared that the agent is only doing it for the investor in order to safeguard the capital in his possession, or the investor is only doing it because the agent has taken his capital and will not return it to him, that is not permitted in qirad and it is part of what the people of knowledge forbid.’ “