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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-zuhd:1396 – ʿAbdullāh from my father > Muʿtamir > Mubārak > ʿAbdullāh b. Muslim from his father

[Machine] "I used to pray in my shoes, and taking them off is easier for me. I only do this to follow the Sunnah."  

الزهد لأحمد:١٣٩٦ – حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنَا أَبِي حَدَّثَنَا مُعْتَمِرٌ عَنْ مُبَارَكٍ عَنْ عَبْدِ اللَّهِ بْنِ مُسْلِمٍ عَنْ أَبِيهِ قَالَ

«إِنِّي لَأُصَلِّي فِي نَعْلِي وَخَلْعُهُمَا أَهْوَنُ عَلَيَّ وَمَا أَطْلُبُ بِذَلِكَ إِلَّا السُّنَّةَ»