Sunan Ibn Majah 482
سنن ابن ماجه#482SahihIt was narrated that Abu Ayyub said:"I heard the Messenger of Allah say: 'Whoever touches his sexual organ, let him 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
Zubair Ali ZaiHasan
In-book reference: 1:216