Sunan Ibn Majah 484
سنن ابن ماجه#484Da'ifIt was narrated that Abu Umamah said:"The Messenger of Allah was asked about touching the penis and he said: 'Rather it is a piece of you (your body)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniVery Daif
Muhammad Fouad Abd al-BaqiVery Daif
Shuaib Al ArnautVery Daif
Zubair Ali ZaiDaif
In-book reference: 1:218