Abu Hurayrah Radiyallahu anhu reports that Rasulullah sallallahu Alayhi Wasallam said:
"The most truthful couplet recited by a poet is that of Labeed bin Rabi'ah: 'verirly be aware, besides the Almighty everything else is futile'. And Ummayyah bin Abis-Sault was about to accept Islaam" (IT)
English reference (IT): Book 36, Hadith 232 (IT)
Arabic reference (IT): Book 37, Hadith 242 (IT)