Muwatta Malik #108
Purity
Yahya related to me from Malik from Abdullah ibn Dinar that
Abdullah ibn Umar related that Umar ibn al-Khattab mentioned to the
Messenger of Allah, may Allah bless him and grant him peace, that he
would sometimes become junub in the night. The Messenger of Allah, may
Allah bless him and grant him peace, said to him, "Do wudu and wash
your penis, and then sleep."
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About Muwatta Malik
This hadith is #108 from Muwatta Malik, in the Book of Purity. Muwatta Malik contains 1,985 hadiths across 61 books.