(Say to them, O Messenger:) "What! shall I seek other than God for judge (to settle the matters between you and me), when it is He Who has sent down to you this (unique, most perfect) Book (in which truth and falsehood, right and wrong are) fully distinguished?" (The scholars among) those to whom We gave the Book before know that it is one being sent down in parts in truth by your Lord. So never be among the doubters (concerning the truth of your way).