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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
ahmad:4132 – Bahz b. Asad > Shuʿbah > Wāṣil al-Aḥdab > Abū Wāʾil

[Machine] Abdullah asked the Messenger of Allah ﷺ : "Which sin is the most grievous?" So, he mentioned it.  

أحمد:٤١٣٢ – حَدَّثَنَا بَهْزُ بْنُ أَسَدٍ حَدَّثَنَا شُعْبَةُ حَدَّثَنَا وَاصِلٌ الْأَحْدَبُ قَالَ سَمِعْتُ أَبَا وَائِلٍ يَقُولُ قَالَ

عَبْدُ اللهِ سَأَلْتُ رَسُولَ اللهِ ﷺ أَيُّ الذَّنْبِ أَعْظَمُ؟ فَذَكَرَهُ