From their own scriptures.

Who does Mohammed claim to be?

Who does Jesus claim to be?

Let all bitterness, and wrath, and anger, and clamour, and evil speaking, be put away from you, with all malice:And be ye kind one to another, tenderhearted, forgiving one another, even as Elohim for Yahushua the Messiah's sake hath forgiven you. Ephesians 4:31-32