مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1367
Musnad 'Ali Ibn Abi Talib
It was narrated from Muhammad bin Ka"b al-Qurazi that ‘Ali (رضي الله عنه) said: I remember when I was with the Messenger of Allah (ﷺ) and I tied a rock to my stomach because of hunger, and now my zakah is forty thousand.
Musnad Ahmad 1367Da'if because it is interrupted]