The book of Devarim is also known as “Mishneh Torah,” generally taken to mean “the repetition of the law” (from which the name “Deuteronomy” is derived). While many mitzvos are repeated throughout the book, many are not – and many mitzvos are introduced for the first time in this book! Rabbi Menachem Leibtag of the Tanach Study Center determines that the actual meaning of “Mishneh Torah” is in fact “the Torah that must be repeated.” He supports this with Deut. 17:18-19, where the phrase is used and whose context supports this interpretation.