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:350ʿAbdullāh > Bī > Yazīd > al-Jurayrī > ʿAbdullāh b. Shaqīq > Kaʿb al-Aḥbār

[Machine] That Musa, ﷺ , used to say in his supplication, "O Allah, soften my heart with repentance and do not make my heart hard like a stone."  

الزهد لأحمد:٣٥٠حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنِي أبِي حَدَّثَنَا يَزِيدُ حَدَّثَنَا الْجُرَيْرِيُّ عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ عَنْ كَعْبِ الْأَحْبَارِ

أَنَّ مُوسَى عَلَيْهِ السَّلَامُ كَانَ يَقُولُ فِي دُعَائِهِ «اللَّهُمَّ لَيِّنْ قَلْبِي بِالتَّوْبَةِ وَلَا تَجْعَلْ قَلْبِي قَاسِيًا كَالْحَجَرِ»