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:2-456bal-Ḥasan And Ghayrih > Ktab ʿUmar > Abiá Mūsá al-Ashʿar
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السيوطي:٢-٤٥٦b

"عَنِ الْحَسَنِ وَغَيْرِه قَالَ: كتَبَ عُمَرُ إِلَى أَبِى مُوسَى الأَشْعَرىَّ أَنِ اقْرأ فِى الْمَغْرِبِ بقِصَارِ الْمُفَصَّلِ، وَفِى الْعِشَاءِ بِوَسَطِ المُفَصَّلِ، وَفِى الصُّبْحِ بِطُوَالِ المُفَصَّلِ".  

[عب] عبد الرازق وابن أبي داود في المصاحف