Al-Kāfi - Volume 2 > The Excellence of the Holy Quran
Hadith #6

6ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ مَحْبُوبٍ عَنْ سَيْفِ بْنِ عَمِيرَةَ عَنْ رَجُلٍ عَنْ أَبِي جَعْفَرٍ (عَلَيهِ السَّلام) قَالَ مَنْ قَرَأَ إِنَّا أَنْزَلْنَاهُ فِي لَيْلَةِ الْقَدْرِ يَجْهَرُ بِهَا صَوْتَهُ كَانَ كَالشَّاهِرِ سَيْفَهُ فِي سَبِيلِ الله وَمَنْ قَرَأَهَا سِرّاً كَانَ كَالْمُتَشَحِّطِ بِدَمِهِ فِي سَبِيلِ الله وَمَنْ قَرَأَهَا عَشْرَ مَرَّاتٍ غُفِرَتْ لَهُ عَلَى نَحْوِ أَلْفِ ذَنْبٍ مِنْ ذُنُوبِهِ.

6. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ibn Mahbub from Sayf ibn ‘Umayrah from a man from abu Ja’far (a.s.) who has said the following: “Whoever reads Chapter 97 of the Holy Quran aloud, he is considered as one unsheathing his sword in the way of Allah, whoever reads it silently he is considered as one who has been socked with his own blood in the way of Allah and whoever reads it ten times, about one thousand of his sins will be forgiven.”