وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ إِسْمَاعِيلَ بْنِ أَبِي حَكِيمٍ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، غَدَا إِلَى أَرْضِهِ بِالْجُرُفِ فَوَجَدَ فِي ثَوْبِهِ احْتِلاَمًا فَقَالَ لَقَدِ ابْتُلِيتُ بِالاِحْتِلاَمِ مُنْذُ وُلِّيتُ أَمْرَ النَّاسِ ‏.‏ فَاغْتَسَلَ وَغَسَلَ مَا رَأَى فِي ثَوْبِهِ مِنَ الاِحْتِلاَمِ ثُمَّ صَلَّى بَعْدَ أَنْ طَلَعَتِ الشَّمْسُ ‏.‏

Yahya related to me from Malik from Ismail ibn Abi Hakim fromSulayman ibn Yasar that Umar ibn al-Khattab went out early in themorning to his land in al-Juruf and found semen on his garment. Hesaid, "I have been tried with wet dreams since I have been entrustedwith governing the people." He did ghusl and washed his garment ofwhat he saw of the semen, and then prayed after the sun had risen. Translation Not Available

Book Ref: Muwatta Imam Malik Book 2 Hadith 113
Web Ref:  Muwatta Imam Malik Book 2 Hadith 83