Two or more than two persons are considered as a group (for the congregational prayers)
باب اثْنَانِ فَمَا فَوْقَهُمَا جَمَاعَةٌ
5341
Sahih Bukhari
Sahih
حَدَّثَنَا أَبُو الْوَلِيدِ، حَدَّثَنَا شُعْبَةُ، عَنْ هِشَامِ بْنِ زَيْدٍ، عَنْ أَنَسٍ، قَالَ دَخَلْتُ عَلَى النَّبِيِّ صلى الله عليه وسلم بِأَخٍ لِي يُحَنِّكُهُ، وَهْوَ فِي مِرْبَدٍ لَهُ، فَرَأَيْتُهُ يَسِمُ شَاةً ـ حَسِبْتُهُ قَالَ ـ فِي آذَانِهَا.
Narrated Anas:
I brought a brother of mine to the Prophet (ﷺ) to do Tahnik for him while the Prophet (ﷺ) was in a sheep fold of his, and I saw him branding a sheep. (The sub-narrator said: I think Anas said, branding it on the ear.)
Reference: Sahih al-Bukhari 5542 In-book : Book 72, Hadith 68 USC-MSA web (English) : Vol. 7, Book 67, Hadith 450 (deprecated)
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