Post History

[AA](https://judaism.codidact.com/users/53049) pointed out in a comment that this is addressed in Makkot 23b-24a.  There the g'mara says that of the 613 mitzvot stated to Moshe, 

> The word Torah, in terms of its numerical value, is 611, the number of mitzvot that were received and taught by Moses our teacher. In addition, there are two mitzvot: “I am the Lord your God” and: “You shall have no other gods”, the first two of the Ten Commandments, that we heard from the mouth of the Almighty, for a total of 613.

I wanted to know where we learn that the first two are different.  The Ramban [writes](https://www.sefaria.org/Makkot.24a.1?lang=bi&p2=Ramban_on_Exodus.20.7.1&lang2=bi) (on Shemot 20:7) that the first two were spoken and understood by all, and the rest were spoken but not understood by the people until Moshe explained them.  (In this last part the Ramban seems to be explaining an Ibn Ezra that the plain meaning of the text is that all ten were spoken to the people.)

> Now the language of this verse, the Name of the Eternal thy G-d, implies that it is as if Moses was speaking, and so also in the case of all the following commandments, whereas in the first two verses G-d is speaking: I; Who brought thee out; before Me; For I; Of them that love Me and keep My commandments. It is for this reason that our Rabbis of blessed memory have said: “We heard the two commandments — I am the Eternal thy G-d and Thou shalt have no other gods — from the Almighty Himself,” for they are the root of everything. 
> 
> But Rabbi Abraham ibn Ezra asked [concerning this tradition of the Rabbis] that Scripture says, And G-d spoke all these words, and still more clearly it is written [following the Ten Commandments], These words the Eternal spoke unto all your assembly, and again it is written there, And He wrote them down upon two Tablets of stone, meaning that as He said the Ten Commandments to all your assembly, so He wrote them down upon the Tablets!
> 
> I will explain to you the tradition of our Rabbis [that we heard the first two commandments from the Almighty Himself]. Surely all Israel heard the entire Ten Commandments from the mouth of G-d, as the literal meaning of Scripture indicates. But in the first two commandments, they heard the utterance of speech and understood their words even as Moses understood them. Therefore He spoke to them directly [in the first person], just as a master speaks to his servant, as I have mentioned. From then on, in the rest of the commandments, they heard a voice of speech but they did not understand it, and it became necessary for Moses to explain to them each and every commandment until they understood it from Moses. And so [the Rabbis] explained: Moses spoke, and G-d answered him by a voice. Therefore [the rest of the Ten Commandments] were addressed by G-d to Moses so that he should tell them thus.