وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، صَلَّى بِالنَّاسِ الصُّبْحَ ثُمَّ غَدَا إِلَى أَرْضِهِ بِالْجُرُفِ فَوَجَدَ فِي ثَوْبِهِ احْتِلاَمًا فَقَالَ إِنَّا لَمَّا أَصَبْنَا الْوَدَكَ لاَنَتِ الْعُرُوقُ ‏.‏ فَاغْتَسَلَ وَغَسَلَ الاِحْتِلاَمَ مِنْ ثَوْبِهِ وَعَادَ لِصَلاَتِهِ ‏.‏

Yahya related to me from Malik from Yahya ibn Said from Sulaymanibn Yasar that Umar ibn al-Khattab led the people in the subh prayerand then went out to his land in Juruf and found semen on his clothes.He said, "Since we have been eating rich meat our veins have becomefulsome." He did ghusl, washed the semen from his clothing, and didhis prayer again. Translation Not Available

Book Ref: Muwatta Imam Malik Book 2 Hadith 114
Web Ref:  Muwatta Imam Malik Book 2 Hadith 84