Hadith 787:6
Muhammad ibn Muqatil narrated to us, Ibn al-Mubarak narrated to us, Mis'ar informed us, from Hammad, who said: "Urine, according to us, is in the status of blood; as long as it is not the amount of a dirham, there is no harm in it."
حدثنا محمد بن مقاتل، حدثنا ابن المبارك، أخبرنا مسعر، عن حماد، قال: " البول عندنا بمنزلة الدم، ما لم يكن قدر الدرهم فلا بأس به "