Sahih al-Bukhari, Hadith 229 ⓘ
Narrated `Aisha: I used to wash the traces of Janaba (semen) from the clothes of the Prophet and he used to go for prayers while traces of water were still on it (water spots were still visible).
حَدَّثَنَا عَبْدَانُ، قَالَ أَخْبَرَنَا عَبْدُ اللَّهِ، قَالَ أَخْبَرَنَا عَمْرُو بْنُ مَيْمُونٍ الْجَزَرِيُّ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، عَنْ عَائِشَةَ، قَالَتْ كُنْتُ أَغْسِلُ الْجَنَابَةَ مِنْ ثَوْبِ النَّبِيِّ صلى الله عليه وسلم، فَيَخْرُجُ إِلَى الصَّلاَةِ، وَإِنَّ بُقَعَ الْمَاءِ فِي ثَوْبِهِ.
also referenced under: Book 4, Hadith 96 (In-Book) & Volume 1, Book 4, Hadith 229 (USC-MSA)