: As part of the record Nephi creates for his people, he quotes heavily from the prophet Isaiah. The source for Nephi's text are the brass plates that he and his brothers obtained from Laban before leaving Jerusalem. Traditionally, the Book of Isaiah has been understood to be the composition of a single author living before Nephi, and before the Babylonian exile. However, modern scholars have found evidence in the Book of Isaiah that it was written by multiple authors spanning periods of time before and during the Babylonian exile, including before and after Nephi and his brothers obtained the brass plates. Nephi quotes from some of the passages of Isaiah that scholars believe were written after Nephi and his family left Jerusalem, creating a conundrum for students of the Book of Mormon.