Alma - 30
Discussion related to this chapter in the Book of Mormon
Korihor, the antichrist, ridicules Christ, the atonement, and the spirit of prophecy. He teaches that there is no God, no fall of man, no penalty for sin, and no Christ. Alma testifies that Christ shall come and that all things denote there is a God. Korihor demands a sign and is struck dumb. The devil had appeared to Korihor as an angel and taught him what to say. He is trodden down and dies. About 74 B.C.
Source: LDS Scriptures