First para­graphs:

The Ram­bam’s Intro­duction to the Mishneh Torah

In the name of God, Lord of the world: “Then I will not be ashamed when I gaze at all Your mitzvot”(Psalms 119:6). The mitzvot given to Moses at Mount Sinai were all given together with their expla­na­tions, as implied by [Exodus 24:12]: “And I will give you the tablets of stone, the Torah, and the mitzvah.”“The Torah” refers to the Written Law; “the mitzvah,” to its expla­nation. [God] com­manded us to fulfill “the Torah” according to [the instruc­tions of] “the mitzvah.” “The mitzvah” is called the Oral Law.