Sahih Muslim
The Book of Poetry (Kitab Al-Shir)
Book Number: 028 / Hadith Number: 5609
Abu Huraira reported Allah's Messenger (may peace be opon him) as saying: It is better for a man's belly to be stuffld with pus which corrodes it than to stuff) one's mind with frivolous poetry. Abd Bakr has reported it with a slight variation Of wording.