Sahih al-Bukhari, Hadith 239 ⓘ
The same narrator said that the Prophet had said: "You should not pass urine in stagnant water which is not flowing then (you may need to) wash in it."
وَبِإِسْنَادِهِ قَالَ " لاَ يَبُولَنَّ أَحَدُكُمْ فِي الْمَاءِ الدَّائِمِ الَّذِي لاَ يَجْرِي، ثُمَّ يَغْتَسِلُ فِيهِ " .
also referenced under: Book 4, Hadith 106 (In-Book) & Volume 1, Book 4, Hadith 240 (USC-MSA)