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:2-2740bIbn Shihāb > ʿUmar b. al-Khaṭṭāb Katab > Abiá Mūsá al-Ashʿari > Mur Man Qibalak Yataʿallam al-ʿArabiyyah Faʾnnahā Tadul > Ṣawāb al-Kalām And Murhum Biriwāyah al-Shiʿr
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السيوطي:٢-٢٧٤٠b

"عَنِ ابْنِ شِهَابٍ أَنَّ عُمَرَ بْنَ الْخَطَّاب كَتَبَ إِلَى أَبِى مُوسَى الأَشْعَرِىِّ: أَنْ مُرْ مَنْ قِبَلَكَ يَتَعَلَّمُ الْعَرَبِيَّة، فَإنَّهَا تَدُلُ عَلَى صَوابِ الْكَلَامِ، وَمُرْهُمْ بِرِوَايَةِ الشِّعْرِ، فَإِنَّهُ يَدُلُّ عَلَى مَعَالِى الأَخْلَاق".  

ابن الأنبارى