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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
ibnmajah:4118 – Kathīr b. ʿUbayd al-Ḥimṣī > Ayyūb b. Sūwayd > Usāmah b. Zayd > ʿAbdullāh b. Abū Umāmah al-Ḥārithī from his father

“The Messenger of Allah ﷺ said: ‘Simplicity is part of faith.’”  

ابن ماجة:٤١١٨ – حَدَّثَنَا كَثِيرُ بْنُ عُبَيْدٍ الْحِمْصِيُّ حَدَّثَنَا أَيُّوبُ بْنُ سُوَيْدٍ عَنْ أُسَامَةَ بْنِ زَيْدٍ عَنْ عَبْدِ اللَّهِ بْنِ أَبِي أُمَامَةَ الْحَارِثِيِّ عَنْ أَبِيهِ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ الْبَذَاذَةُ مِنَ الإِيمَانِ قَالَ الْبَذَاذَةُ الْقَشَافَةُ يَعْنِي التَّقَشُّفَ