39 For it shall come to pass, that which I spake by the mouths of my prophets shall be fulfilled; for I will consecrate of the riches of those who embrace my gospel among the Gentiles unto the poor of my people who are of the house of Israel. (D&C 42)
What true prophets have spoken and written, before this passage was given in 1831, WILL be fulfilled. No one now, regardless of the claims they make, can contradict what God has declared in scripture.
We can also know by this passage that those who contradict, wrest, or transform the Holy Word of God, no matter how kind-hearted, well-intentioned, earnestly lovable, or seemingly harmless, are by God's own statement not true prophets.
Any questions?
