Simply put the history of the Scripture is such that God doesnt ever need to retract anything He reveals, this came from a jewish person i studied with.
Why? Because everything is part of Gods great plan, this is what i learnt in Christianity.
In Christianity itself, nothing can invalidate in anyway the Tawrah, for it is correct and true scripture.
Therefore anything or anyone that invalidates it as the Quran claims to do, does not find its source in God.
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