Muwatta Malik #112
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ زُيَيْدِ بْنِ الصَّلْتِ، 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 .
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."
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About Muwatta Malik
This hadith is #112 from Muwatta Malik, in the Book of Purity.