Hadith 951:2
Ya'la narrated to us, Muhammad ibn 'Amr narrated to us, from Yahya ibn 'Abd al-Rahman, who said: 'Umar passed by Hassan while he was reciting poetry in the mosque. He said, "In the mosque of the Messenger of Allah, may Allah bless him and grant him peace, you recite poetry?" He said, "I used to recite it while there was someone in it who was better than you," or "I used to recite it in it, while there was someone in it who was better than you."
حدثنا يعلى، حدثنا محمد بن عمرو، عن يحيى بن عبد الرحمن، قال: مر عمر على حسان، وهو ينشد الشعر في المسجد، فقال: في مسجد رسول الله صلى الله عليه وسلم تنشد الشعر؟ قال: " قد كنت أنشد وفيه من هو خير منك " أو " كنت أنشد فيه، وفيه من هو خير منك "