42:1 “Behold, my servant, whom I uphold, my chosen, in whom my soul delights: I have put my Spirit on him. He will bring justice to the nations.
Both the Bible and Quran state that God makes promises and keeps them. If God didn't protect his transmission of promises, how would we know he has kept them, especially when considering promises about Muhammed for example?
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Christ in Islam and Christianity, John Gilchrist
Al-Masihu-Isa: The Glory of Jesus the Messiah, John Gilchrist