Demonstrating the impossibility of lying for prophets, and arguing that it is rationally impossible for a miracle to occur for a false one.
God does not Signify Lies
Proving that lying is impossible for God, to an opponent who grants that Speech is a necessary attribute, and that Muhammed ﷺ is a man who God revealed information to.
Sounds and Letters are Created
Some claim that Allah ﷻ’s attribute of speech is composed of uncreated utterances pronouncing Arabic words. We argue that this impossible, because such pronunciations would exist contingently, and what is contingent depends on a creator to have brought it into existence.
Al-Razi: the Essence of Speech
Before arguing that God is attributed with speech, it is first important to understand what we mean by “speech”. Of particular importance, is the distinction between speech and the utterances which signify it. This article presents Imam Al-Razi's argument for this distinction.
The Miracle as Proof for Speech
Using the occurrence of miracles, to argue for the existence of the attribute of Speech. This is given the fact that miracles are expressions of conventional signification.
Keys to the Unseen 