Aside from the parts copied from his version of the bible, the book was written by scribes as dictated by Joseph Smith. He was known as a particularly good orator and often gave sermons for hours without any prepared notes. He also practiced telling stories about native Americans as a teen based on legends of the mound-builders of Hebrew heritage which, per his mother, entertained his family for hours. He borrowed stories like Lehi's vision of the tree of life from his father's experience and contemporary religious themes (like baptism of infants) from local preaching. His deep immersion in a biblical/ magical christian community may have been a source for some hebraisms (such as names and chiasmus) as they continue to appear in subsequent revelations.