2 Nephi 23:22

"...yea, for I will be merciful unto my people, but the wicked shall perish."

This will happen in the Second Coming. The Lord will save his people, those who are faithful to him and live righteously. The wicked, those who follow Satan, will be destroyed. This is his word, and he cannot go against it. It is so important to follow Christ. I do not want to be destroyed.