Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
abudawud:373 – [Chain 1] ʿAbdullāh b. Muḥammad al-Nufaylī > Zuhayr [Chain 2] Muḥammad b. ʿUbayd b. Ḥisāb al-Baṣrī

I heard 'Aishah say that she would wash semen from the clothe of the Messenger of Allah ﷺ. She added: Then I would see a mark or marks (after washing).  

أبو داود:٣٧٣ – حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ النُّفَيْلِيُّ حَدَّثَنَا زُهَيْرٌ ح حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدِ بْنِ حِسَابٍ الْبَصْرِيُّ حَدَّثَنَا سُلَيْمٌ يَعْنِي ابْنَ أَخْضَرَ الْمَعْنَى وَالإِخْبَارُ فِي حَدِيثِ سُلَيْمٍ قَالاَ حَدَّثَنَا عَمْرُو بْنُ مَيْمُونِ بْنِ مِهْرَانَ سَمِعْتُ سُلَيْمَانَ بْنَ يَسَارٍ يَقُولُ

سَمِعْتُ عَائِشَةَ تَقُولُ إِنَّهَا كَانَتْ تَغْسِلُ الْمَنِيَّ مِنْ ثَوْبِ رَسُولِ اللَّهِ ﷺ قَالَتْ ثُمَّ أَرَى فِيهِ بُقْعَةً أَوْ بُقَعًا  

See similar narrations below:

Collected by Bukhārī
bukhari:232 – ʿAmr b. Khālid > Zuhayr > ʿAmr b. Maymūn b. Mihrān > Sulaymān b. Yasār > ʿĀʾishah

I used to wash the semen off the clothes of the Prophet ﷺ and even then I used to notice one or more spots on them.  

البخاري:٢٣٢ – حَدَّثَنَا عَمْرُو بْنُ خَالِدٍ قَالَ حَدَّثَنَا زُهَيْرٌ قَالَ حَدَّثَنَا عَمْرُو بْنُ مَيْمُونِ بْنِ مِهْرَانَ عَنْ سُلَيْمَانَ بْنِ يَسَارٍ عَنْ عَائِشَةَ

أَنَّهَا كَانَتْ تَغْسِلُ الْمَنِيَّ مِنْ ثَوْبِ النَّبِيِّ ﷺ ثُمَّ أَرَاهُ فِيهِ بُقْعَةً أَوْ بُقَعًا