על עשרת הדברות ה׳On the Decalogue 5
א׳
1[18] These are the reasons suggested to answer the question under discussion: they are but probable surmises; the true reasons are know to God alone. Having said what was fitting on this subject, I will proceed to describe the laws themselves in order, with this necessary statement by way of introduction, that some of them God judged fit to deliver in His own person alone without employing any other, and some through His prophet Moses whom He chose as of all men the best suited to be the revealer of verities.
ב׳
2[19] Now we find that those which He gave in His own person and by His own mouth alone include both laws and heads summarizing the particular laws, but those in which He spoke through the prophet all belong to the former class.