Hammam bin Harith narrated:"A guest came and stayed with 'Aishah, and she ordered that he be given a yellow blanket of hers. He had a nocturnal emission on it, and he felt too shy to send it back to send it back to her when it had the traces of that emission on it, so he dipped it in water and then sent it to her. 'Aishah said: 'Why did he spoil our garment? It would have been sufficient for him to scrape it off with his finger. I often scraped it (semen) from the garment of the Messenger of Allah with my finger.'"
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَعَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنِ الأَعْمَشِ، عَنْ إِبْرَاهِيمَ، عَنْ هَمَّامِ بْنِ الْحَارِثِ، قَالَ نَزَلَ بِعَائِشَةَ ضَيْفٌ فَأَمَرَتْ لَهُ بِمِلْحَفَةٍ لَهَا صَفْرَاءَ فَاحْتَلَمَ فِيهَا فَاسْتَحْيَى أَنْ يُرْسِلَ بِهَا وَفِيهَا أَثَرُ الاِحْتِلاَمِ فَغَمَسَهَا فِي الْمَاءِ ثُمَّ أَرْسَلَ بِهَا فَقَالَتْ عَائِشَةُ لِمَ أَفْسَدْتَ عَلَيْنَا ثَوْبَنَا إِنَّمَا كَانَ يَكْفِيكَ أَنْ تَفْرُكَهُ بِإِصْبَعِكَ رُبَّمَا فَرَكْتُهُ مِنْ ثَوْبِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ بِإِصْبَعِي .
IbnMaja
The Book of Purification and its Sunnah • Hadith 538