Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
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:1167b – Ibn Abū ʿUmar > ʿAbd al-ʿAzīz / al-Darāwardī > Yazīd > Muḥammad b. Ibrāhīm > Abū Salamah b. ʿAbd al-Raḥman > Abū Saʿīd al-Khudrī

" That he adhered to his place of i'tikaf and his forehead was besmeared with mud and water."  

مسلم:١١٦٧b – وَحَدَّثَنَا ابْنُ أَبِي عُمَرَ حَدَّثَنَا عَبْدُ الْعَزِيزِ يَعْنِي الدَّرَاوَرْدِيَّ عَنْ يَزِيدَ عَنْ مُحَمَّدِ بْنِ إِبْرَاهِيمَ عَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ

عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ ؓ أَنَّهُ قَالَ كَانَ رَسُولُ اللَّهِ ﷺ يُجَاوِرُ فِي رَمَضَانَ الْعَشْرَ الَّتِي فِي وَسَطِ الشَّهْرِ وَسَاقَ الْحَدِيثَ بِمِثْلِهِ غَيْرَ أَنَّهُ قَالَ فَلْيَثْبُتْ فِي مُعْتَكَفِهِ وَقَالَ وَجَبِينُهُ مُمْتَلِئًا طِينًا وَمَاءً