Ibn ‘Umar told how ‘Umar b. al-Khattab mentioned to God’s messenger that he was affected by seminal defilement during the night, and was told to perform ablution, wash his penis, and go back to sleep. (Bukhari and Muslim.)
Hadith Referenceمشكوة المصابيح / كتاب الطهارة / 452
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (290) و مسلم (25/ 306)»