Urwah bin al-Zubayr (may Allah have mercy on him) said: Abdullah bin Ja'far (may Allah be pleased with them both) bought a piece of land for six hundred thousand dirhams, and Sayyiduna Ali and Sayyiduna Uthman (may Allah be pleased with them both) intended to place a restriction on his financial dealings. He said: I met Sayyiduna al-Zubayr (may Allah be pleased with him), and he said: No one has made a cheaper purchase than the one you have made. Then Abdullah (may Allah be pleased with him) mentioned the restriction on him, and he said: If I had the money, I would be your partner. He said: I will lend you half the money. He said: Then I am your partner. He said: Then Sayyiduna Ali and Sayyiduna Uthman (may Allah be pleased with them both) came to the two of them while they were discussing. Sayyiduna al-Zubayr (may Allah be pleased with him) asked: What are you discussing? They mentioned the restriction on Abdullah (may Allah be pleased with him). Sayyiduna al-Zubayr (may Allah be pleased with him) said: Will you place a restriction on a man whose partner I am? They said: No, by my life! He said: I am his partner. Then the restriction was dropped.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحجر / 11335