Hadith 36:14
Ash-Sharid said, "The Prophet, may Allah bless him and grant him peace, asked me to recite the poetry of Umayya ibn Abi's-Salt and I recited it. The Messenger of Allah, may Allah bless him and grant him peace, began to say, 'Go on, go on!' until I had recited a hundred lines.' The Prophet said, 'If only he had become Muslim.'"
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ: حَدَّثَنَا عَبْدُ اللهِ بْنُ عَبْدِ الرَّحْمَنِ بْنِ يَعْلَى قَالَ: سَمِعْتُ عَمْرَو بْنَ الشَّرِيدِ، عَنِ الشَّرِيدِ قَالَ: اسْتَنْشَدَنِي النَّبِيُّ صلى الله عليه وسلم شِعْرَ أُمَيَّةَ بْنِ أَبِي الصَّلْتِ، وَأَنْشَدْتُهُ، فَأَخَذَ النَّبِيُّ صلى الله عليه وسلم يَقُولُ: هِيهِ، هِيهِ حَتَّى أَنْشَدْتُهُ مِئَةَ قَافِيَةٍ، فَقَالَ: إِنْ كَادَ لَيُسْلِمُ
Original Reference: Al-Adab Al-Mufrad 869