Musnad Ahmad 785:14

Rawh narrated to us, Zakariya ibn Ishaq narrated to us, Ibrahim ibn Maysarah narrated to us, that he heard ‘Amr ibn al-Sharid saying: Al-Sharid said: I was riding behind the Messenger of Allah, may Allah bless him and grant him peace, and he said to me: "Do you have any of the poetry of Umayyah ibn Abi al-Salt with you?" I said: "Yes." He said: "Recite to me." So I recited a verse to him, and he did not cease saying to me whenever I recited to him: "Go on," until I had recited one hundred verses to him. He said: Then the Prophet, may Allah bless him and grant him peace, remained silent.