Two or more than two persons are considered as a group (for the congregational prayers)
باب اثْنَانِ فَمَا فَوْقَهُمَا جَمَاعَةٌ
7231
Sahih Bukhari
Sahih
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا سُفْيَانُ، عَنْ صَالِحٍ، عَنْ عُبَيْدِ اللَّهِ، عَنْ زَيْدِ بْنِ خَالِدٍ، قَالَ مُطِرَ النَّبِيُّ صلى الله عليه وسلم فَقَالَ قَالَ اللَّهُ أَصْبَحَ مِنْ عِبَادِي كَافِرٌ بِي وَمُؤْمِنٌ بِي "
Narrated Zaid bin Khalid:
It rained (because of the Prophet's invocation for rain) and the Prophet (ﷺ) said, "Allah said, 'Some of My slaves have become disbelievers in Me, and some others, believers in Me.'"
Reference: Sahih al-Bukhari 7503 In-book : Book 97, Hadith 128 USC-MSA web (English) : Vol. 9, Book 93, Hadith 594 (deprecated)
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