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.
tirmidhi:313Isḥāq b. Mūsá al-Anṣārī > Maʿn > Mālik > Abū Nuʿaym Wahbb. Kaysān > Jābir b. ʿAbdullāh

"Whoever prayed a Rak'ah in which he did not recite Umm Al-Qur'an, then he did not pray except if he was behind an Imam."  

[Abu 'Eisa said:] This Hadith is Hasan Sahih.
الترمذي:٣١٣حَدَّثَنَا إِسْحَاقُ بْنُ مُوسَى الأَنْصَارِيُّ حَدَّثَنَا مَعْنٌ حَدَّثَنَا مَالِكٌ عَنْ أَبِي نُعَيْمٍ وَهْبِ بْنِ كَيْسَانَ أَنَّهُ سَمِعَ جَابِرَ بْنَ عَبْدِ اللَّهِ يَقُولُ مَنْ صَلَّى رَكْعَةً لَمْ يَقْرَأْ فِيهَا بِأُمِّ الْقُرْآنِ فَلَمْ يُصَلِّ إِلاَّ أَنْ يَكُونَ وَرَاءَ الإِمَامِ
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قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ