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:2-1919bal-Ḥsn
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السيوطي:٢-١٩١٩b

"عَنِ الحسن قال: إن كان أحد يعرف الْكَذِبَ إذا حُدِّثَ بِه أنَّهُ كَذِبٌ فهو عمر بن الخطاب".  

مسدد، [كر] ابن عساكر في تاريخه