Sunan Ibn Majah 480
سنن ابن ماجه#480SahihIt was narrated that Jabir bin 'Abdullah said:"The Messenger of Allah said: 'If anyone of you touches his penis, then he has to perform ablution
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih Lighairihi
Shuaib Al ArnautSahih Lighairihi
Zubair Ali ZaiHasan
In-book reference: 1:214