Sahih Muslim 1168
'Abdullah b. Unais reported Allah's Messenger (ﷺ) as saying:
I was shown Lailat-ul-Qadr; then I was made to forget it, and saw that I was prostrating in water and clay in the morning of that (night). He (the narrator) said: There was a downpour on the twenty-third night and the Messenger of Allah (ﷺ) led us in prayer, and as he went back, there was a trace of water and clay on his forehead and on his nose. He (the narrator) said: 'Abdullah b. Unais used to say that it was the twenty-third (night).
وَحَدَّثَنَا سَعِيدُ بْنُ عَمْرِو بْنِ سَهْلِ بْنِ إِسْحَاقَ بْنِ مُحَمَّدِ بْنِ الأَشْعَثِ بْنِ قَيْسٍ، الْكِنْدِيُّ وَعَلِيُّ بْنُ خَشْرَمٍ قَالاَ حَدَّثَنَا أَبُو ضَمْرَةَ، حَدَّثَنِي الضَّحَّاكُ بْنُ عُثْمَانَ، - وَقَالَ ابْنُ خَشْرَمٍ عَنِ الضَّحَّاكِ بْنِ عُثْمَانَ، - عَنْ أَبِي النَّضْرِ، مَوْلَى عُمَرَ بْنِ عُبَيْدِ اللَّهِ عَنْ بُسْرِ بْنِ، سَعِيدٍ عَنْ عَبْدِ اللَّهِ بْنِ أُنَيْسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏
"‏ أُرِيتُ لَيْلَةَ الْقَدْرِ ثُمَّ أُنْسِيتُهَا وَأَرَانِي صُبْحَهَا أَسْجُدُ فِي مَاءٍ وَطِينٍ ‏"‏ ‏.‏ قَالَ فَمُطِرْنَا لَيْلَةَ ثَلاَثٍ وَعِشْرِينَ فَصَلَّى بِنَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَانْصَرَفَ وَإِنَّ أَثَرَ الْمَاءِ وَالطِّينِ عَلَى جَبْهَتِهِ وَأَنْفِهِ ‏.‏ قَالَ وَكَانَ عَبْدُ اللَّهِ بْنُ أُنَيْسٍ يَقُولُ ثَلاَثٍ وَعِشْرِينَ ‏.‏