Before Muhammad no true prophet that I am aware of claimed previously established revelation was corrupted and should not be followed. Furthermore, no true believers ever followed such teaching.
For example, no true prophet taught, “Oh, what Moses taught is corrupted. Don’t read it. I’ll set the record straight. ”
The prophet Isaiah never questioned the reliability of previously revealed Scripture.
King David never questioned the authenticity of previously revealed Scripture.
Jesus never questioned the authenticity of previously revealed Scripture. In fact, Jesus’ followers included the Old Testament Scriptures as part of their Scripture.
Muhammad was therefore unlike any prophet who ever came before. His followers are unlike any other previous followers of the one true God, because they do not read as Scripture Moses, the prophets or the Psalms.
The Gospel of Barnabas is Evidence of Corruption (Tahrif)
For centuries Muslims have been offering the Gospel of Barnabas as proof that the Christian Scriptures were corrupted. However, the Gospel of Barnabas appears to have been written in the 16th century.
Presenting a 16th century work to disprove Matthew, Mark, Luke and John is corruption. For hundreds of years, Muslims have been guilty of tahrif.
Islam stands on the wrong side of the truth by adding to Scripture (Gospel of Barnabas) and subtracting from Scripture (omitting previous revelation).
Can Muhammad be a true prophet of God, since his message of corruption and omission of previously established revelation is unlike any other true prophet?
I invite you to read the true gospels: Matthew, Mark, Luke and John.
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