Al-Ala' bin Irar (may Allah have mercy on him) said: Sayyiduna Ibn Umar (may Allah be pleased with them both) was asked about Sayyiduna Ali and Sayyiduna Uthman (may Allah be pleased with them both), and he said: "As for Sayyiduna Ali (may Allah be pleased with him), do not ask (me) about him; rather, look at his high rank and standing with the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) closed all our doors that opened into the mosque and kept his door (open). As for Sayyiduna Uthman (may Allah be pleased with him), on the day the two hosts met (that is, the day of Uhud) he committed a great slip, and Allah Almighty forgave him; then he did something among you far less than that, and you killed him."
Hadith Referenceالمعجم الأوسط / باب الألف / 1166
Hadith Takhrij«قال أبو حاتم الرازي: هذا يدخل بينهما العلاء بن عرار رواه زيد بن أبي أنيسة وغيره عن أبي إسحاق عن العلاء بن عرار عن ابن عمر قال أبي ذاك نقص رجل وهذا أشبه «علل الحديث، ج 6، ص 451»» «أخرجه النسائي فى «السنن الكبرى» برقم: 8436، 8435، 8437، وعبد الرزاق فى «مصنفه» برقم: 9766، 20408، والطحاوي فى «شرح مشكل الآثار» برقم: 3558، والطبراني فى «الكبير» برقم: 13760»