The Prophet ( sal Allaahu alayhi wa sallam ) said : None amongst you should urinate in stagnant water , and then wash in it. (Using translation from Abū Dāʾūd 69)  

عَنِ النَّبِيِّ ﷺ قَالَ «لَا يَبُولُ أَحَدُكُمْ فِي الْمَاءِ الدَّائِمِ ثُمَّ يَغْتَسِلُ مِنْهُ»