Sahih Bukhari
Prophetic Commentary on the Quran (Tafseer of the Prophet (PBUH))
Volume: 006 / Book Number: 060 / Hadith Number: 237
Narrated Abu Huraira:
The Prophet said, "The recitation of Psalms (David's Quran) 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."