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:2-1756bMḥmd b. Syryn
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السيوطي:٢-١٧٥٦b

"عن محمد بن سيرين قال: كان عمر بن الخطاب قد اعتراه نسيان في الصلاة، فجعل رجلًا خلفه يلقنه، فإذا أومى إليه أن يسجد أو يقوم فعل".  

ابن سعد