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.
muslim:1167e[Chain 1] ʿAbd b. Ḥumayd > ʿAbd al-Razzāq > Maʿmar [Chain 2] ʿAbdullāh b. ʿAbd al-Raḥman al-Dārimī > Abū al-Mughīrah > al-Awzāʿī

I saw the Messenger of Allah ﷺ after he had completed (the prayer) and there was a trace of clay on his forehead and tip (of the nose).  

مسلم:١١٦٧eوَحَدَّثَنَا عَبْدُ بْنُ حُمَيْدٍ أَخْبَرَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا مَعْمَرٌ ح وَحَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ الدَّارِمِيُّ أَخْبَرَنَا أَبُو الْمُغِيرَةِ حَدَّثَنَا الأَوْزَاعِيُّ كِلاَهُمَا

عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ بِهَذَا الإِسْنَادِ نَحْوَهُ وَفِي حَدِيثِهِمَا رَأَيْتُ رَسُولَ اللَّهِ ﷺ حِينَ انْصَرَفَ وَعَلَى جَبْهَتِهِ وَأَرْنَبَتِهِ أَثَرُ الطِّينِ