مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2999
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The Prophet (ﷺ) went to the outhouse and I put some water for him to do wudoo’. When he came out he said: Who put this here?” He said: Ibn 'Abbas. He said: “O Allah, grant him deep understanding of the faith.”
Musnad Ahmad 3022Its isnad is saheeh, al-Bukhari (143) and Muslim (2477)]