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Mormons don’t believe in the Trinity so have your Mormon friend explain their ‘scripture’ to you.
If they believe the Bible’s been mistranslated then why are the prophets in the BoM using it? And why are they using it when they don’t believe in the Trinity? D&C 130:22 clearly states the God of the Bible doesn’t exist in this fashion.
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3 Nephi 11:27; “And after this manner shall ye baptize in my name; for behold, verily I say unto you, that the Father, and the Son, and the Holy Ghost are one; and I am in the Father, and the Father in me, and the Father and I are one.”