مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1569
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated from Muhammad bin Sa"d that his father said: The Messenger of Allah (ﷺ) said: "If the belly of one of you were to be filled with pus, that would be better than filling [his mind] with poetry.”
Musnad Ahmad 1569Sahih (Darussalam) [ Muslim (2258).