مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2553
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn 'Abbas (رضي الله عنه) that One of the wives of the Prophet (ﷺ) washed herself following janabah, then the Prophet (ﷺ) came and did wudoo’ using her left over water. She said: I did ghusl using it. He said: “Nothing makes water najis (impure).”
Musnad Ahmad 2566Saheeh because of corroborating evidence, and its isnad is d