Abraham
In the name of God, Most Gracious, Most Merciful.[14:10]
Their apostles said: "Is there a doubt about God, The Creator of the heavens and the earth? It is He Who invites you, in order that He may forgive you your sins and give you respite for a term appointed!" They said: "Ah! ye are no more than human, like ourselves! Ye wish to turn us away from the (gods) our fathers used to worship: then bring us some clear authority."

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* v.10 : The Prophets (generally) clear both kinds of doubt. "You cannot doubt the existence of Allah! Behold Ms works! We are not speaking for ourselves or deceiving you. We speak according to the Message of inspiration from Allah.- Notice that the doubters had said to the Prophets, -Ye invite us.- The Prophets say: "It is Allah Who invites you, and He does it to save you by His grace, and give you plenty of time (but not indefinite time) for penitence and amendment.’
* Infidelity is illogical and argues in a circle. If the Prophet speaks of Allah, the Unbeliever says, ’You are only a man!- ’But I speak from Allah!- "Oh well! our ancestral ways of worship are good enough for us!" -What if they are wrong?" "What authority have you for saying so?" "The highest authority, that from Allah!" And so we come back full circle! Then the wicked rely on violence, but it recoils on them, and they perish.