It is narrated from Muhammad bin Jubayr (may Allah have mercy on him) that Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) passed by Sayyiduna Uthman (may Allah be pleased with him) while he was sitting in the mosque. He greeted him with salam, but he did not reply. So Sayyiduna Umar (may Allah be pleased with him) went to Sayyiduna Abu Bakr (may Allah be pleased with him) and complained to him about the matter, saying: "I passed by Uthman and greeted him, but he did not reply to me." He asked: "Where is he?" Sayyiduna Umar (may Allah be pleased with him) said: "He is sitting in the mosque." The narrator says: Then we both set off towards him, and Sayyiduna Abu Bakr (may Allah be pleased with him) asked him: "What prevented you from returning your brother's greeting?" He replied: "By Allah, I did not even realise that he had greeted me. He passed by me while I was thinking something over within myself, so I did not notice his greeting." Sayyiduna Abu Bakr (may Allah be pleased with him) asked: "What were you saying within yourself?" He said: "Satan found me alone and began to cast such things into my heart that I would hate to bring them onto my tongue even more than I would like to be given all the wealth and goods of the earth. While Satan was casting those whisperings into my heart, I said to myself: 'If only I had asked the Messenger of Allah (peace and blessings be upon him) what the word is that saves us from these thoughts that Satan casts into our hearts!'" Then Sayyiduna Abu Bakr (may Allah be pleased with him) said: "By Allah, I did ask the Messenger of Allah (peace and blessings be upon him) about this; I asked him (peace and blessings be upon him) what it is that saves us from these whisperings that Satan casts into our hearts. The Messenger of Allah (peace and blessings be upon him) said: 'What will save you from this state is the word that I commanded my uncle to say at the time of his death, but he did not accept it.'"
Hadith Referenceمسند أبي يعلى الموصلي / مسند أبي بكر الصديق رضي الله عنه / 133
Hadith Gradingمحدثین:إسناده ضعيف لانقطاعه
Hadith Takhrij«حکم الحدیث مسند ابی یعلی محققاً تنسیق حسين سليم أسد - مکتبہ شاملہ :قال حسين سليم أسد: إسناده ضعيف لانقطاعه . » «قال سعيد بن محمد السناري: ضعيف» «أخرجه مسند أحمد برقم: 21، وأخرجه مجمع الزوائد ومنبع الفوائد برقم: 84، وأخرجه الأحاديث المختارة برقم: 6، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 6، مسند ابویعلیٰ ترقیم الاثری: 128»