It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A man's prayer offered alone in the path of Allah Almighty is equal in reward to twenty-five prayers, his prayer offered in the company of his companions is equal to nine hundred prayers, and his prayer offered in congregation is equal in reward to forty-nine thousand prayers."
Imam Abu Ya'la recorded this hadith in his Musnad.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب الصلاة / 402
Hadith Gradingمحدثین:إسناده ضعيف جدًا
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف جدًا. » «انفرد به المصنف من هذا الطريق»