Two or more than two persons are considered as a group (for the congregational prayers)
باب اثْنَانِ فَمَا فَوْقَهُمَا جَمَاعَةٌ
1255
Sahih Bukhari
Sahih
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا زُبَيْدٌ الْيَامِيُّ، عَنْ إِبْرَاهِيمَ، عَنْ مَسْرُوقٍ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم لَيْسَ مِنَّا مَنْ لَطَمَ الْخُدُودَ، وَشَقَّ الْجُيُوبَ، وَدَعَا بِدَعْوَى الْجَاهِلِيَّةِ "
Narrated `Abdullah:
the Prophet (ﷺ) said, "He who slaps his cheeks, tears his clothes and follows the ways and traditions of the Days of Ignorance is not one of us."
Reference: Sahih al-Bukhari 1294 In-book : Book 23, Hadith 53 USC-MSA web (English) : Vol. 2, Book 23, Hadith 382 (deprecated)
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