It is narrated from Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace be upon him) said: "Offering prayer in congregation is twenty-seven degrees more virtuous than a man's (individual) prayer."
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 271
Hadith Takhrijأخرجہ البخاری: الأذان، باب فضل صلاۃ الجماعۃ: 646 - ومسلم المساجد، باب فضل صلاۃ الجماعۃ وبيان التشديد في التخلف عنها وأنها فرض كفاية : 650۔
It is narrated from Abu Huraira (may Allah be pleased with him) that the Prophet (peace be upon him) said: "Performing prayer in congregation is twenty-five times more virtuous than performing prayer alone among you."
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 272
It is narrated from Nafi' (may Allah have mercy on him) that Ibn Umar (may Allah be pleased with him) was in Baqi', and when he heard the iqamah, he hurried towards the mosque.
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 273
Hadith Takhrijأخرجہ عبد الرزاق : 3411 و ابن ابی شیبہ : 7395۔