مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2098
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: "Nothing makes water najis.”
Musnad Ahmad 2100Saheeh because of corroborating evidence]