Imam al-Sha'bi (may Allah have mercy on him) said that Sayyiduna al-Miqdad (may Allah be pleased with him) borrowed seven thousand dirhams from Sayyiduna Uthman bin Affan (may Allah be pleased with him). When he asked for repayment, he said: It was four thousand. So the dispute came to Sayyiduna Umar (may Allah be pleased with him). Sayyiduna Uthman (may Allah be pleased with him) said: I lent al-Miqdad seven thousand dirhams. Sayyiduna al-Miqdad (may Allah be pleased with him) said: It was four thousand; make him swear that it was seven thousand. Sayyiduna Umar (may Allah be pleased with him) said: He has been fair to you. But he refused to take the oath, so Sayyiduna Umar (may Allah be pleased with him) said: Take what he gives you.
This chain is sahih, except that it is munqati' (broken).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20740