Regarding of Ramadan

Narrated Abu Huraira (RA): I heard Allah’s Messenger (peace be upon him) saying regarding Ramadan, “Whoever prayed at night in it (the month of Ramadan) out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven.” (Sahih al-Bukhari, Vol. 3, Book 31, Hadith 1)