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"And hold fast, all of you together, to the Rope of Allaah (i.e, this Qur'aan), and be not divided among yourselves, and remember Allaah's Favour on you, for you were enemies one to another but He joined your hearts together, so that, by His Grace, you became brethren (in Islaamic Faith), and you were on the brink of a pit of Fire, and He saved you from it, Thus Allaah makes His Ayaat (proofs, evidences, verses, lessons, signs, revelations, etc.,) clear to you, that you may be guided." [Aal-'Imraan (3):103]

Narrated 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." [The Book of Faith Volume 1, Book 2, Hadeeth 42]