وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، أَنَّهُ قَالَ رَأَيْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ يَبُولُ قَائِمًا ‏.‏ قَالَ يَحْيَى وَسُئِلَ مَالِكٌ عَنْ غَسْلِ الْفَرْجِ مِنَ الْبَوْلِ وَالْغَائِطِ هَلْ جَاءَ فِيهِ أَثَرٌ فَقَالَ بَلَغَنِي أَنَّ بَعْضَ مَنْ مَضَى كَانُوا يَتَوَضَّئُونَ مِنَ الْغَائِطِ وَأَنَا أُحِبُّ أَنْ أَغْسِلَ الْفَرْجَ مِنَ الْبَوْلِ ‏.‏

Yahya related to mefrom Malikthat Abdullah ibn Dinar said, "I sawAbdullah ibn Umar urinating while standing." Yahya said thatMalik was asked if any hadith had come down about washing the privateparts of urine and faeces and he said, "I have heard that some ofthose who have passed away used to wash themselves of faeces. I liketo wash my private parts of urine." Translation Not Available

Book Ref: Muwatta Imam Malik Book 2 Hadith 143
Web Ref:  Muwatta Imam Malik Book 2 Hadith 114