It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When the imam says: 'Not of those who have earned (Your) anger, nor of those who go astray,' and the followers behind him say 'Amin' (O Allah, accept), and the 'Amin' of the people of the heaven and the people of the earth coincide, Allah Almighty forgives that servant his previous sins." He further said: "The example of one who does not say 'Amin' is like a man who joined some people in a military expedition; then they cast lots, and all their arrows came out (successfully) but his arrow did not come out. He asked (in astonishment): 'Why did my arrow not come out?' He was answered: 'Because you did not say Amin.'"
Hadith Referenceمسند أبي يعلى الموصلي / تابع مسند أبي هريرة رضي الله عنه / 6411
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث مسند ابی یعلی محققاً تنسیق حسين سليم أسد - مکتبہ شاملہ :قال حسين سليم أسد: إسناده ضعيف . » «قال سعيد بن محمد السناري: منكر بهذا التمام» «أخرجه مجمع الزوائد ومنبع الفوائد برقم: 2664، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 1261، مسند ابویعلیٰ ترقیم الاثری: 6380»