Sunan Abi Dawud 221
سنن أبي داود#221Sahih‘Abd Allah b. ‘Umar reported :‘Umar b. al-Khattab said to the Messenger of Allah (May peace be upon him) that he became sexually defiled at night (asking him what he should do). The Messenger of Allah (May peace be upon him) said : You should perform ablution and wash your penis and then sleep
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (290) Sahih Muslim (306)
In-book reference: 1:221