It was narrated that Abu Hurairah said:"The Messenger of Allah said: 'No one among you should urinate into standing water
Hadith No. 344
Sunan Ibn Majah
Gradings:
Al-Albani:
Sahih
Muhammad Fouad Abd al-Baqi:
Sahih
Shuaib Al Arnaut:
Sahih
Zubair Ali Zai:
Isnaad Hasan