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.
ahmad-zuhd:2288ʿAbdullāh > ʿUthmān > Jarīr > ʿUmar b. Thābit

[Machine] "Abi Musa had a Quran and he used to call it the key to the heart."  

الزهد لأحمد:٢٢٨٨حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنَا عُثْمَانُ حَدَّثَنَا جَرِيرٌ عَنْ عُمَرَ بْنِ ثَابِتٍ قَالَ

«كَانَ لِأَبِي مُوسَى مُصْحَفٌ وَكَانَ يُسَمِّيهِ لُبَابَ الْفُؤَادِ»