Sahih al-Bukhari 4713
Sahih al-Bukhari · Book 65: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) · The Statement of Allah the Exalted: "...And to Dāwūd (David) We gave the Zabūr (Psalms) ." (V.17:55)
Narrated Abu Huraira:
حَدَّثَنِي إِسْحَاقُ بْنُ نَصْرٍ ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ ، عَنْ مَعْمَرٍ ، عَنْ هَمَّامٍ ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " خُفِّفَ عَلَى دَاوُدَ الْقِرَاءَةُ، فَكَانَ يَأْمُرُ بِدَابَّتِهِ لِتُسْرَجَ، فَكَانَ يَقْرَأُ قَبْلَ أَنْ يَفْرُغَ " . يَعْنِي الْقُرْآنَ .
The Prophet (ﷺ) said, "The recitation of Psalms (David's Qur'an) was made light and easy for David that he used to have his ridding animal be saddled while he would finish the recitation before the servant had saddled it."