Prayer (Kitab Al-Salat): Detailed Injunctions about Ramadan
Dawud :: Book 6 : Hadith 1395
Narrated AbuHurayrah:
The Prophet (peace_be_upon_him) said: A surah of the Qur'an containing thirty verses will intercede its reader till he will be forgiven. That is: "Blessed is He in Whose Hand is the sovereignty" (Surah 67).