Here "Moses and the prophets" represent the things that they wrote. Alternate translation: "If they do not pay attention to what Moses and the prophets wrote" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Abraham states what would happen if the hypothetical situation occurred. It can be stated in active form. Alternate translation: "neither will a person who comes back from the dead be able to convince them" or "they will not believe even if a person comes back from the dead" (See: [[rc://en/ta/man/translate/figs-hypo]] and [[rc://en/ta/man/translate/figs-activepassive]])