Concerning one who enters the mosque while the Imam is delivering the sermon Sunan Ibn Majah 1113
Arabic hadith text
حَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، أَنْبَأَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنِ ابْنِ عَجْلاَنَ، عَنْ عِيَاضِ بْنِ عَبْدِ اللَّهِ، عَنْ أَبِي سَعِيدٍ، قَالَ جَاءَ رَجُلٌ وَالنَّبِيُّ ـ صلى الله عليه وسلم ـ يَخْطُبُ فَقَالَ " أَصَلَّيْتَ؟" . قَالَ: لاَ . قَالَ: " فَصَلِّ رَكْعَتَيْنِ "
Translation
It wasnarrated that Abu Sa’eed said
“A man entered the mosque whentheProphet (ﷺ) was delivering the sermon. He said: ‘Have youprayed?’ He said: ‘No.’ He said: ‘Then pray two Rak’ah.’”