Sunan Abu Dawud
182
Sahih+2

Narrated Talq: We came upon the Prophet of Allah (ﷺ). A man came to him: he seemed to be a bedouin. He said: Prophet of Allah, what do you think about a man who touches his penis after performing ablution? He (ﷺ) replied: That is only a part of his body. Abu Dawud said: The tradition has been transmitted through a different chain of narrators

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid