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.
suyuti:610-3bMas al-Dhakar
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السيوطي:٦١٠-٣b

"أن النَّبِىَّ ﷺ سُئِلَ عَنْ مَس الذَّكَرِ فَقَالَ: هَلْ هُوَ إِلَّا جَزْوَةٌ مِنْكَ".  

[ش] ابن أبى شيبة

See similar narrations below:

Collected by Ibn Mājah
ibnmajah:484ʿAmr b. ʿUthmān b. Saʿīd b. Kathīr b. Dīnār al-Ḥimṣī > Marwān b. Muʿāwiyah > Jaʿfar b. al-Zubayr > al-Qāsim > Abū Umāmah

"The Messenger of Allah was asked about touching the penis and he said: 'Rather it is a piece of you (your body).'"  

ابن ماجة:٤٨٤حَدَّثَنَا عَمْرُو بْنُ عُثْمَانَ بْنِ سَعِيدِ بْنِ كَثِيرِ بْنِ دِينَارٍ الْحِمْصِيُّ حَدَّثَنَا مَرْوَانُ بْنُ مُعَاوِيَةَ عَنْ جَعْفَرِ بْنِ الزُّبَيْرِ عَنِ الْقَاسِمِ عَنْ أَبِي أُمَامَةَ قَالَ

سُئِلَ رَسُولُ اللَّهِ ﷺ عَنْ مَسِّ الذَّكَرِ فَقَالَ إِنَّمَا هُوَ حذية مِنْكَ