This is the Book in which there is no doubt, a guide for the righteous.
And if you are in doubt about what We have revealed to Our servant, then produce a chapter like these, and call your witnesses apart from God, if you are truthful. But if you do not-and you will not-then beware the Fire whose fuel is people and stones, prepared for the disbelievers.
This Quran guides to what is most upright; and it gives good news to the believers who do good deeds, that they will have a great reward.