240Sahih BukhariSahihوَبِإِسْنَادِهِ قَالَ لاَ يَبُولَنَّ أَحَدُكُمْ فِي الْمَاءِ الدَّائِمِ الَّذِي لاَ يَجْرِي، ثُمَّ يَغْتَسِلُ فِيهِ "The same narrator said that the Prophet (ﷺ) had said:"You should not pass urine in stagnant water which is not flowing then (you may need to) wash in it."Reference: Sahih al-Bukhari 239 In-book : Book 4, Hadith 106 USC-MSA web (English) : Vol. 1, Book 4, Hadith 240 (deprecated)