Sahih al-Bukhari 229
Book 4: Ablutions (Wudu') · Narrated by `Aisha
Arabic
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.
English translation
Narrated `Aisha:I used to wash the traces of Janaba (semen) from the clothes of the Prophet (ﷺ) and he used to go for prayers while traces of water were still on it (water spots were still visible)
Reference: Sahih al-Bukhari 229, Book of Ablutions (Wudu'). English translation by Dr. Muhammad Muhsin Khan.