Mishkat al-Masabih #458
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ سُلَيْمَانَ بْنِ يَسَارٍ قَالَ: سَأَلْتُ عَائِشَةَ عَنِ الْمَنِيِّ يُصِيبُ الثَّوْبَ فَقَالَتْ كُنْتُ أَغْسِلُهُ مِنْ ثَوْبِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَيَخْرُجُ إِلَى الصَّلَاةِ وَأَثَرُ الْغَسْلِ فِي ثَوْبه بقع المَاء
Sulaiman b. Yasir said that he asked ‘A’isha about the prostatic fluid which gets on to a garment, and she replied, “I used to wash it from the garment at God's messenger, and he would go out to prayer with the mark of the washing on his garment."
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #458 from Mishkat al-Masabih, in the Book of Purification.