مُوَطَّأُ مَالِكٍ
Muwatta Malik 143
Purity
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 saw Abdullah ibn Umar urinating while standing." Yahya said that Malik was asked if any hadith had come down about washing the private parts of urine and faeces and he said, "I have heard that some of those who have passed away used to wash themselves of faeces. I like to wash my private parts of urine."
Arabic/English book reference: Book 2, Hadith 114