Sahih Bukhari
Sahih Bukhari Volume 001, Book 002, Hadith Number 042.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 02. Belief
Narated By Anas : The Prophet said, "Whoever said "None has the right to be worshipped but Allah and has in his heart good (faith) equal to the weight of a barley grain will be taken out of Hell. And whoever said: "None has the right to be worshipped but Allah and has in his heart good (faith) equal to the weight of a wheat grain will be taken out of Hell. And whoever said, "None has the right to be worshipped but Allah and has in his heart good (faith) equal to the weight of an atom will be taken out of Hell."