Muwatta Malik Book 8, Hadith 2
Yahya related to me from Malik from Ibn Shihab from Said ibn al-
Musayyab from Abu Hurayra that the Messenger of Allah, may Allah bless
him and grant him peace, said, "Prayer in congregation is better than
the prayer of one of you on his own by twenty-five parts."
Yahya related to me from Malik from Nafi from Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and grant him peace, said, "Prayer in congregation is better than the prayer of a man by himself by twenty-seven degrees."
Yahya related to me from Malik from Abu'zZinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "By Him in whose hand myself is! I had in mind to order firewood to be collected, then to order the prayer to be called, and to appoint a man to lead the people in prayer, and then to come up behind certain men and burn their houses down about them! By Him in whose hand myself is! If one of them knew that he would find a meaty bone or two good legs of meat, he would be present at isha.''