Mishkat al-Masabih #459
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن الْأسود وَهَمَّام عَنْ عَائِشَةَ قَالَتْ: كُنْتُ أَفْرُكُ الْمَنِيَّ مِنْ ثَوْبِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ. رَوَاهُ مُسلم
وَبِرِوَايَةِ عَلْقَمَةَ وَالْأَسْوَدِ عَنْ عَائِشَةَ نَحْوَهُ وَفِيهِ: ثمَّ يُصَلِّي فِيهِ
Al-Aswad and Hammam reported ‘A'isha as saying, “I used to rub the prostatic fluid from the garment of God's messenger."
Muslim transmitted it. A version of ‘Alqama and al-Aswad quotes ‘A'isha to the same effect, with the addition that he then prayed in it.
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About Mishkat al-Masabih
This hadith is #459 from Mishkat al-Masabih, in the Book of Purification.