It is better for the belly of any one of you to be stuffed with pus rather than to stuff (one's mind) with poetry.
Sahih Muslim Book 41, Hadith 9
← Previous Hadith It is better for a man's belly to be stuffed with pus which corrodes it than to stuff (one's mind) with frivolous poetry. Abu Bakr has reported it with a slight variation of wording.

Sahih Muslim Book 41, Hadith 8 Next Hadith → We were going with Allah's Messenger (ﷺ). As we reached the place (known as) `Arj there met (us) a poet who had been reciting poetry. Thereupon Allah's Messenger (ﷺ) said: Catch the satan or detain the satan, for filling the belly of a man with pus is better than stuffing his brain with poetry.

Sahih Muslim Book 41, Hadith 10