حَدَّثَنَا أَبُو أَحْمَدَ مُحَمَّدُ بْنُ عَبْدِ اللَّهِ حَدَّثَنَا سُفْيَانُ عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ عَنِ ابْنِ عُمَرَ عَنْ عُمَرَ رَضِيَ اللَّهُ عَنْهُ أَنَّهُ أَتَى النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ إِنَّهُ تُصِيبُنِي الْجَنَابَةُ فَأَمَرَهُ أَنْ يَغْسِلَ ذَكَرَهُ وَيَتَوَضَّأَ وُضُوءَهُ لِلصَّلَاةِ
مسند امام احمد بن حنبل · Hadith 263
It was narrated from 'Umar (RA) that he went to the Prophet (PBUH) and said: Sometimes I become junub. He told him to wash his private parts and do wudoo' as for prayer (i.e., then go to sleep, and do glut si before Fajr).
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020