Al-Kāfi - Volume 3 > Draining Urine, Washing and If One Does Not Find Water
Hadith #7

7ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنِ الْحُسَيْنِ بْنِ أَبِي الْعَلاَءِ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) عَنِ الْبَوْلِ يُصِيبُ الْجَسَدَ قَالَ صُبَّ عَلَيْهِ الْمَاءَ مَرَّتَيْنِ. وَرُوِيَ أَنَّهُ يُجْزِئُ أَنْ يَغْسِلَ بِمِثْلِهِ مِنَ الْمَاءِ إِذَا كَانَ عَلَى رَأْسِ الْحَشَفَةِ وَغَيْرِهِ. وَرُوِيَ أَنَّهُ مَاءٌ لَيْسَ بِوَسَخٍ فَيَحْتَاجَ أَنْ يُدْلَكَ.

7. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from Al-Husayn ibn abu al-‘Ala’ who has said the following: “I once asked abu ’Abd Allah, ‘Alayhi al-Salam, about urine which pollutes the body. He (the Imam) said, Tour water on it twice.’ It is a narration that one can wash it with the same amount of water if it is on the tip of the penis or on something else. It also is a narration that it is water and not dirt and it needs to be dropped down.’”