As opposed to other Codifiers of Halacha (e.g. Shulchan Aruch Harav see Hilchos Talmud Torah 1:1, 2:1 and the Kuntres Acharon there) the Rambam famously doesn't provide the reasons for the Mitzvahs and Halochos in his Mishneh Torah (See also Tshuvos Harosh 31:9).
This apparently correlates with his opinion that the Mitzvah of Yedias Hatorah "...ולמדתם אותם" does not include the reasons of the halochos and just necessitates the knowledge of the final halacha (explicit in the above Kuntres Acharon and I recall but can't remember the Rambam mentioning this).
Does anyone have sources within the Rambam or from others backing this up from any Gemoro or other Rishonim or any sources discussing Rambam's opinion?