It is narrated from Muhammad bin Sirin (may Allah have mercy on him) that a man in Kufah testified that Sayyiduna Uthman (may Allah be pleased with him) was killed attaining the rank of martyrdom, whereupon the officials there seized him and brought him to Sayyiduna Ali (may Allah be pleased with him) and said: "Had you not forbidden us from killing anyone, we would certainly have killed him. This man claims and testifies that Sayyiduna Uthman (may Allah be pleased with him) is a martyr."
At this the man addressed Sayyiduna Ali (may Allah be pleased with him) and said: "And you yourself will testify to this, or you will remember, that I came to the Messenger of Allah (peace and blessings be upon him) and he (peace and blessings be upon him) gave to me; then I came to Sayyiduna Abu Bakr (may Allah be pleased with him) and asked him, and he too gave generously to me." Then the narrator mentioned the full hadith.
[Musnad Abi Ya'la: 3905]
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب المناقب / 3905
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف » «أخرجه مجمع الزوائد ومنبع الفوائد برقم: 14543، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 6600»