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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
muslim:1226b – Isḥāq b. Ibrāhīm And Muḥammad b. Ḥātim > Wakīʿ > Sufyān

" A person said according to his personal opinion, and it was Umar."  

مسلم:١٢٢٦b – وَحَدَّثَنَاهُ إِسْحَاقُ بْنُ إِبْرَاهِيمَ وَمُحَمَّدُ بْنُ حَاتِمٍ كِلاَهُمَا عَنْ وَكِيعٍ حَدَّثَنَا سُفْيَانُ عَنِ الْجُرَيْرِيِّ فِي هَذَا الإِسْنَادِ

وَقَالَ ابْنُ حَاتِمٍ فِي رِوَايَتِهِ ارْتَأَى رَجُلٌ بِرَأْيِهِ مَا شَاءَ يَعْنِي عُمَرَ