Book of Abraham
A section of the Pearl of Great Price, and thus a part of LDS scripture. It talks about gods creating the world and refers to Kolob, the star closest to God’s throne. Joseph Smith claimed to have translated it from Egyptian papyri he obtained. This was disproved in 1967 when these papyri were found in the Metropolitan Museum in New York. It was quickly ascertained that they contained a description of Egyptian burial rites and not the Book of Abraham.
Christians sometimes emphasize this to Mormons in the hope of their seeing the faulty foundation of Mormonism. Most Mormons, however, shrug this proof off.