Narrated AbusSamh:

I used to serve the Prophet ﷺ. Whenever he intended to wash himself, he would say: Turn your back towards me, So I would turn my back and hide him. (Once) Hasan or Husayn (may Allah be pleased with them) was brought to him and he passed water on his chest. I came to wash it. He said: It is only the urine of a female which should be washed; the urine of a male should be sprinkled over.

'Abbas (a narrator) said: Yahya b. al-Walid narrated the tradition to us. Abu Dawud said: He (Yahya) is Abu al-Za'ra'. Harun b. Tamim said on the authority of al-Hasan: All sorts of urine are equal.

حَدَّثَنَا مُجَاهِدُ بْنُ مُوسَى، وَعَبَّاسُ بْنُ عَبْدِ الْعَظِيمِ الْعَنْبَرِيُّ، - الْمَعْنَى - قَالاَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، حَدَّثَنِي يَحْيَى بْنُ الْوَلِيدِ، حَدَّثَنِي مُحِلُّ بْنُ خَلِيفَةَ، حَدَّثَنِي أَبُو السَّمْحِ، قَالَ كُنْتُ أَخْدُمُ النَّبِيَّ ﷺ فَكَانَ إِذَا أَرَادَ أَنْ يَغْتَسِلَ قَالَ " وَلِّنِي قَفَاكَ " . فَأُوَلِّيهِ قَفَاىَ فَأَسْتُرُهُ بِهِ فَأُتِيَ بِحَسَنٍ أَوْ حُسَيْنٍ - رضى الله عنهما - فَبَالَ عَلَى صَدْرِهِ فَجِئْتُ أَغْسِلُهُ فَقَالَ " يُغْسَلُ مِنْ بَوْلِ الْجَارِيَةِ وَيُرَشُّ مِنْ بَوْلِ الْغُلاَمِ " . قَالَ عَبَّاسٌ حَدَّثَنَا يَحْيَى بْنُ الْوَلِيدِ . قَالَ أَبُو دَاوُدَ وَهُوَ أَبُو الزَّعْرَاءِ . قَالَ هَارُونُ بْنُ تَمِيمٍ عَنِ الْحَسَنِ قَالَ الأَبْوَالُ كُلُّهَا سَوَاءٌ .