6. Prayer (Kitab Al-Salat) Detailed Injunctions about Ramadan - كتاب شهر رمضان
10) Chapter: On The Number Of Verses In A Surah
Narrated AbuHurayrah:
The Prophet (ﷺ) 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).