He it is Who has revealed the Book to thee; some of its verses are decisive -- they are the basis of the Book -- and others are allegorical. Then those in whose hearts is perversity follow the part of it which is allegorical, seeking to mislead, and seeking to give it (their own) interpretation. And none knows its interpretation save Allah, and those firmly rooted in knowledge. They say: We believe in it, it is all from our Lord. And none mind except men of understanding.