Peter Leads the Church Astray:

One of the most powerful depictions of fallibility is on the part of the Apostle Peter, considered by the LDS church as the first of the New Testament Living Prophets:

Galatians 2:11-16:  But when Peter was come to Antioch, I withstood him to the face, because he was to be blamed.  For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.  And the other Jews dissembled likewise with him; insomuch that Barnabas also was carried away with their dissimulation.  But when I saw that they walked not uprightly according to the truth of the gospel, I said unto Peter before them all, If thou, being a Jew, livest after the manner of Gentiles, and not as do the Jews, why compellest thou the Gentiles to live as do the Jews?  We who are Jews by nature, and not sinners of the Gentiles, Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law:  for by the works of the law shall no flesh be justified.

Peter led both Jews and Gentiles astray with the teaching that anyone who wanted to receive eternal life had to be circumcised and follow other Jewish laws.  It was necessary for the Apostle Paul to publicly call Peter out to get Peter to recognize his error and recant his words.