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Shiavault - a Vault of Shia Islamic Books Al-Ilahiyyat Volume 1 Truthfulness Muslims (in general) and theologians (in particular) have agreed that “as-Sadiq”, the Truthful One, is one of His Attributes although they have differed about how to prove it. What is meant by His being Truthful is that His speech is above the stain of falsehood. Since we have opted to regard “speech” as an operative attribute, truthfulness in speech will be similar to it.
But if describing someone as being truthful, it means applying an operative attribute, actually standing through Allah, the Praised One; describing Him is best done likewise. One can produce the evidence about His truthfulness by saying that lying is abominable by reason, and the most Praised One is above anything which reason regards as an abomination. The evidence is based on goodness and ugliness, this is a matter realized by reason.
Regardless of incidents and obstacles, a thing is likewise judged as being good or ugly. This principle is the important matter that divided logicians into two groups. If we take the positive aspect in that principle, where the truth is, it proves that the most Praised One is truthful. But the Asharis, who deny both what is rationally good or ugly, describe the most Praised One as being truthful.
They once seek evidence from falsehood being a deficiency, while it is impossible for Allah to be deficient, and once by saying that the Sharia has told us that He is truthful, yet both evidences are scratched off! As for the First, had we advocated rational goodness and ugliness, it will be impossible to attribute a shortcoming to Allah, Praised is He, in the aspect of the Self and the action. His own Self is above shortcomings, and so is His action, such as speaking.
But if we deny that principle, there is no evidence of the impossibility in finding fault with Allah, Praise belongs to Him, with regard to His actions although applying shortcomings to His own Self is absolutely impossible. For this reason, the Asharis say that He, Praise belongs to Him, can be unfair, an oppressor, and the same applies to the rest of abominable things, although these things are not done by Him by token of His telling us so.
As for the Second, since proving His truthfulness legitimately depends on the truth in what the Prophet says, and his truthfulness is proven only if Allah, Praise belongs to Him, testifies to his being truthful.