Sahih (Sahih Muslim)
وَحَدَّثَنَا 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 صلى الله عليه وسلم حِينَ انْصَرَفَ وَعَلَى جَبْهَتِهِ وَأَرْنَبَتِهِ أَثَرُ الطِّينِ .
This hadith has been reported on the authority of Yahya b. Abu Kathir with the same chain of transmitters (with a slight variation of these words):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)