Sahih al-Bukhari 645
Book 10: Call to Prayers (Adhaan) · Narrated by `Abdullah bin `Umar
Arabic
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " صَلاَةُ الْجَمَاعَةِ تَفْضُلُ صَلاَةَ الْفَذِّ بِسَبْعٍ وَعِشْرِينَ دَرَجَةً ".
English translation
Narrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) said, "The prayer in congregation is twenty seven times superior to the prayer offered by a person alone
Reference: Sahih al-Bukhari 645, Book of Call to Prayers (Adhaan). English translation by Dr. Muhammad Muhsin Khan.