The Book of Prayer
Bulugh al-Maram #303
كتاب الصلاة
وَعَنْهُ - رضى الله عنه - "أَنَّ عُمَرَ - رضى الله عنه - مُرَّ بِحَسَّانَ يَنْشُدُ فِي اَلْمَسْجِدِ, فَلَحَظَ إِلَيْهِ, فَقَالَ: "قَدْ كُنْتُ أَنْشُدُ, وَفِيهِ مَنْ هُوَ خَيْرٌ مِنْكَ". مُتَّفَقٌ عَلَيْهِ.
Narrated:
Umar came over Hassan while reciting poetry inside the mosque and looked at him sternly, then he (Hassan) said: “I used to recite poetry inside it (the mosque) in the presence of one who is more pious than you “.
وَعَنْهُ - رضى الله عنه - "أَنَّ عُمَرَ - رضى الله عنه - مُرَّ بِحَسَّانَ يَنْشُدُ فِي اَلْمَسْجِدِ , فَلَحَظَ إِلَيْهِ , فَقَالَ : "قَدْ كُنْتُ أَنْشُدُ , وَفِيهِ مَنْ هُوَ خَيْرٌ مِنْكَ" . مُتَّفَقٌ عَلَيْهِ .
Umar came over Hassan while reciting poetry inside the mosque and looked at him sternly, then he (Hassan) said: "I used to recite poetry inside it (the mosque) in the presence of one who is more pious than you ".
— Bulugh al-Maram, Hadith 303