Sahih al-Bukhari 239

Book 4: Ablutions (Wudu')

Arabic

وَبِإِسْنَادِهِ قَالَ ‏ "‏ لاَ يَبُولَنَّ أَحَدُكُمْ فِي الْمَاءِ الدَّائِمِ الَّذِي لاَ يَجْرِي، ثُمَّ يَغْتَسِلُ فِيهِ ‏"‏‏.‏

English translation

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, Book of Ablutions (Wudu'). English translation by Dr. Muhammad Muhsin Khan.