Amr ibn Shareed radiyallahu anhu reports that his father said, I once accompanied Rasoolullah sallallahu alaihe wasallam and sat behind him on a conveyance. I recited a hundred couplets of Umayyah ibn Sault to Rasoolullah sallallahu alaihe wasallam. After reciting a couplet Rasoolullah sallallahu alaihe wasallam said "continue" till I recited a hundred couplets. In the end Rasoolullah sallallahu alaihe wasallam said, "He (Umayyah) was close to accepting Islam." (FR)
English reference (FR): Book 36, Hadith 238 (FR)
Arabic reference (FR): Book 37, Hadith 249 (FR)