Musannaf Ibn Abi Shayba 13:3448

Abu Bakr narrated to us, he said: Mu'tamir ibn Sulayman narrated to us, from Salm ibn Abi al-Dhayyal, who said: I asked al-Hasan about two partners who bought merchandise, then sold it for a profit, partly for cash and partly on credit. One of them said to his companion: "Give me my capital in cash, and whatever remains is yours." Al-Hasan disliked that.