{And We did not send before you any messenger or prophet except that when he wished, Satan cast into his wish. But Allah abrogates what Satan casts; then Allah strengthens His verses. And Allah is Knowing and Wise. That He may make what Satan casts a trial for those in whose hearts is a disease and those whose hearts are hardened. And indeed, the wrongdoers are in extreme dissension. And so those who were given knowledge may know that it is the truth from your Lord} (Al-Hajj 52-54).

He (Glory be to Him) informed us that the decisive verses [Muhkamat] are the "Mother of the Book," and He also informed us that those in whose hearts is deviation follow only the allegorical verses [Mutashabihat], by His saying (the Exalted): {It is He who has sent down to you the Book; in it are verses [that are] decisive—they are the Mother of the Book—and others are allegorical. As for those in whose hearts is deviation, they follow that which is allegorical...}