Sahih al Bukhari 5047
Virtues of the Qur'an
حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، حَدَّثَنَا شُعْبَةُ، حَدَّثَنَا أَبُو إِيَاسٍ، قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ مُغَفَّلٍ، قَالَ رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم يَقْرَأُ وَهْوَ عَلَى نَاقَتِهِ ـ أَوْ جَمَلِهِ ـ وَهْىَ تَسِيرُ بِهِ وَهْوَ يَقْرَأُ سُورَةَ الْفَتْحِ أَوْ مِنْ سُورَةِ الْفَتْحِ قِرَاءَةً لَيِّنَةً يَقْرَأُ وَهْوَ يُرَجِّعُ.
Narrated `Abdullah bin Mughaffal:I saw the Prophet (ﷺ) reciting (Qur'an) while he was riding on his she camel or camel which was moving, carrying him. He was reciting Surat Fath or part of Surat Fath very softly and in an Attractive vibrating tone
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.