مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1506
Musnad Abu Ishaq Sa'd bin Abi Waqqas
It was narrated from Muhammad bin Sa"d, from Sa"d (رضي الله عنه), that The Prophet (ﷺ) said: “If the belly of one of you were to be filled with pus that corrodes it, that would be better than filling (his mind) with poetry.”
Musnad Ahmad 1506Sahih (Darussalam), Muslim (2258)]