Bulugh al-Maram 2 The Book of Prayer كتاب الصلاة 124

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 . 1 1 – صحيح . رواه البخاري (3212) ، ومسلم (2485) .

Narrated [Abu Hurairah (RA)]: 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 [i.e. the Prophet (صلى الله عليه وسلم)]”. [Agreed upon].