Abinadi cites these verses to give the foundation for his argument. The pivot against which these verses become relevant is the declaration of the priests of the Noah that they teach the law of Moses (Mosiah 12:28). Abinadi therefore begins by reciting the compact form of the law of Moses.
Textual: The 1830 breaks a chapter here. While this is an awkward chapter break for a modern reader because it splits a continuous speech (though no more so that the current way this event is split up), it nevertheless appears to follow a regular rule of Mormon's editorial method. He is citing a source up to this point. The chapter break occurs when the citation ends and Mormon interjects some of his own words.
Translation: These verses are included with no changes from the KJV other than spelling (such as "shewing/showing" "neighbour/neighbor").