Yahya related to me from Malik from Hisham ibn Urwa that Zuyayd ibn as-Salt said, "I went with Umar ibn al-Khattab to Juruf and he looked down and noticed that he had had a wet dream and had prayed without doing ghusl. He exclaimed, 'By Allah I realise that I have had a wet dream and did not know it and have not done ghusl.' So he did ghusl and washed off whatever he saw on his garment, and sprinkled with water whatever he did not see.Then he gave the adhan or the iqama and prayed in the midmorning."  

أَنَّهُ قَالَ خَرَجْتُ مَعَ عُمَرَ بْنِ الْخَطَّابِ إِلَى الْجُرُفِ فَنَظَرَ فَإِذَا هُوَ قَدِ احْتَلَمَ وَصَلَّى وَلَمْ يَغْتَسِلْ فَقَالَ وَاللَّهِ مَا أَرَانِي إِلاَّ احْتَلَمْتُ وَمَا شَعَرْتُ وَصَلَّيْتُ وَمَا اغْتَسَلْتُ قَالَ فَاغْتَسَلَ وَغَسَلَ مَا رَأَى فِي ثَوْبِهِ وَنَضَحَ مَا لَمْ يَرَ وَأَذَّنَ أَوْ أَقَامَ ثُمَّ صَلَّى بَعْدَ ارْتِفَاعِ الضُّحَى مُتَمَكِّنًا  

[Machine] "And by Allah, I did not see myself except that I had dreamed, and I did not feel, and I prayed, and I did not wash myself, so I washed and cleaned what was seen on his garment and sprinkled what was not seen, and he called the call to prayer and stood, then he prayed after the rise of the sun, firmly uttering the name of Ibn Bukayr."  

وَاللهِ مَا أُرَانِي إِلَّا قَدِ احْتَلَمْتُ وَمَا شَعَرْتُ وَصَلَّيْتُ وَمَا اغْتَسَلْتُ فَاغْتَسَلَ وَغَسَلَ مَا رَأَى فِي ثَوْبِهِ وَنَضَحَ مَا لَمْ يَرَ وَأَذَّنَ وَأَقَامَ ثُمَّ صَلَّى بَعْدَ ارْتِفَاعِ الضُّحَى مُتَمَكِّنًا لَفْظُ ابْنِ بُكَيْرٍ  

"عَنْ زُبَيْدِ بْنِ الصَّلْتِ قَالَ: خرجتُ مع عمر بن الخطاب إلى الْجُرفِ فنظرَ فإذَا هو قد احتلَم وَصلَّى ولم يغتسل فقال: واللَّه ما أرانِى إلا قد احتلمتُ وما شَعَرْتُ، وصليت وما اغتسلت، فاغتسلَ وغسل ما رأى في ثوبه، وَنَضَح مَا لَمْ يَرَ وأذَّنَ وَأقَامَ، ثم صلَّى -بعد ارتفاع الشمس- الضُّحى مُتَمَكِّنًا".