Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:23162a
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السيوطي:٢٣١٦٢a

"مَنْ لَمْ يَقْرَأ مَعَ الإِمَامِ فصَلاتُهُ خِدَاجٌ".  

ابن عساكر عن ابن عمرو بن ميمون بن مهران عن أَبيه عن جده

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Collected by Suyūṭī
suyuti:610-52bAbiá Umāmah
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السيوطي:٦١٠-٥٢b

"عَنْ أَبِى أُمَامَةَ قَالَ: قَالَ رَسُولُ الله ﷺ مَنْ لَمْ يَقْرأ خَلفَ الإمَامِ فَصَلَاتَه خَداجٌ".  

[ق] البيهقى في السنن في القراءة