In this passage, the 1905 LDS edition accidentally dropped the repeated the before prophecies; the LDS text has continued with this reading. The repeated determiner is a Hebraistic characteristic of the Book of Mormon text and should be maintained wherever there is evidence for it, as here. For further discussion, see under conjunctive repetition in volume 3. The critical text will restore the repeated the here.
Summary: Restore in Alma 23:5 the repeated the in the conjunctive noun phrase “the records and the prophecies”.