Follow the Living Prophets, pg. 112-113; “Relying only upon canonized scriptures, observed President Wilford Woodruff, “would scarcely be sufficient to guide us twenty-four hours” (in Journal of Discourses 9:324)…Elder Orson F. Whitney said:… The Latter-day Saints do not do things because they happen to be printed in a book. They do not do things because God told the Jews to do them; nor do they do or leave undone anything because of the instructions that Christ gave to the Nephites. Whatever is done by this Church is because God, speaking from heaven in our day, has commanded this Church to do it. No book presides over this Church, and no book lies at its foundation. You cannot pile up books enough to take the place of God’s priesthood… That is the constitution of the Church of Christ. … Divine revelation adapts itself to the circumstances and conditions of men, and change upon change ensues as God’s progressive work goes on to its destiny. There is no book big enough or good enough to preside over this Church. (In Conference Report, October 1916, p. 55.)”
Mark 16:15; “And he said unto them, Go ye into all the world, and preach the gospel to every creature.”
So what Jesus told the Israelites isn’t enough. That my friend is heresy.