Call to Prayers (Adhaan)
10/30. Chapter:
Superiority of the congregational Salat (prayer)
وَكَانَ الأَسْوَدُ إِذَا فَاتَتْهُ الْجَمَاعَةُ ذَهَبَ إِلَى مَسْجِدٍ آخَرَ. وَجَاءَ أَنَسٌ إِلَى مَسْجِدٍ قَدْ صُلِّيَ فِيهِ، فَأَذَّنَ وَأَقَامَ وَصَلَّى جَمَاعَةً.Whenever Al-Aswad missed the congregational Salat (prayer) he used to go to another mosque (to offer the Salat in congregation). Once, Anas came to a mosque where the Salat was finished; he pronounced the Adhan and then Iqama and offered the Salat in congregation.
Sahih Bukhari
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا اللَّيْثُ، حَدَّثَنِي ابْنُ الْهَادِ، عَنْ عَبْدِ اللَّهِ بْنِ خَبَّابٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّهُ سَمِعَ النَّبِيَّ صلى الله عليه وسلم يَقُولُ " صَلاَةُ الْجَمَاعَةِ تَفْضُلُ صَلاَةَ الْفَذِّ بِخَمْسٍ وَعِشْرِينَ دَرَجَةً ".
Narrated Abu Sa`id Al-Khudri: The Prophet (ﷺ) said, "The prayer in congregation is twenty five times superior to the prayer offered by person alone."
Reference : Sahih al-Bukhari 646In-book reference : Book 10, Hadith 43USC-MSA web (English) reference : Vol. 1, Book 11, Hadith 619