Two or more than two persons are considered as a group (for the congregational prayers)
باب اثْنَانِ فَمَا فَوْقَهُمَا جَمَاعَةٌ
5115
Sahih Bukhari
Sahih
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، حَدَّثَنَا مَالِكٌ، قَالَ حَدَّثَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم لاَعَنَ بَيْنَ رَجُلٍ وَامْرَأَتِهِ، فَانْتَفَى مِنْ وَلَدِهَا فَفَرَّقَ بَيْنَهُمَا، وَأَلْحَقَ الْوَلَدَ بِالْمَرْأَةِ.
Narrated Ibn `Umar:
The Prophet (ﷺ) made a man and his wife carry out Lian, and the husband repudiated her child. So the Prophet got them separated (by divorce) and decided that the child belonged to the mother only.
Reference: Sahih al-Bukhari 5315 In-book : Book 68, Hadith 64 USC-MSA web (English) : Vol. 7, Book 63, Hadith 235 (deprecated)
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