Hadith 585
Chapter 99: Those who say that the sexually impure should not sleep until he performs ablution like his ablution for prayer - كتاب الطهارة وسننها
حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ، حَدَّثَنَا عَبْدُ الأَعْلَى، حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عُمَرَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، قَالَ لِرَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ أَيَرْقُدُ أَحَدُنَا وَهُوَ جُنُبٌ قَالَ " نَعَمْ إِذَا تَوَضَّأَ " .
It was narrated from Ibn 'Umar that :
'Umar bin Khattab said to the Messenger of Allah: "can anyone of us sleep if he is sexually impure?" He said: "Yes, if he performs ablution."
Reference : Sunan Ibn Majah 585
In-book reference : Book 1, Hadith 319