Narrated Abu Huraira: The Prophet said, "Whoever fasted the month of Ramadan out of sincere Faith (i.e. belief) and hoping for a reward from Allah, then all his past sins will be forgiven, and whoever stood for the prayers in the night of Qadr out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven ."
— Sahih Bukhari, Volume 3, Book 32: Praying at Night in Ramadaan (Taraweeh), Hadith #3528
Narrated Abu Huraira: The Prophet said, "Whoever fasted the month of Ramadan out of sincere Faith (i.e. belief) and hoping for a reward from Allah, then all his past sins will be forgiven, and whoever stood for the prayers in the night of Qadr out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven ."
This hadith is from the book of Praying at Night in Ramadaan (Taraweeh) in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 3528 in book 32 of volume 3.
