Deuteronomy 18:20-22

18:20 But the prophet who speaks a word presumptuously in my name, which I have not commanded him to speak, or who speaks in the name of other gods, that same prophet shall die.”

Key Source: Like Moses

Many Muslims claim that in Deuteronomy 18:15-18 Moses was referring to Muhammad as "a prophet like me". However, a quick comparison shows that Muhammad was not like Moses is several significant ways.

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18:21 You may say in your heart, “How shall we know the word which the LORD has not spoken?”

18:22 When a prophet speaks in the LORD’s name, if the thing doesn’t follow, nor happen, that is the thing which the LORD has not spoken. The prophet has spoken it presumptuously. You shall not be afraid of him.