Where does the concept of Ben Adam Lemakom and Ben Adam Lechavero come from?
I know there is a concept of the first five of the ten commandments being between 'man and his friend' and the second five being between 'man and G-d' (lit. the place) but I am trying to find out who introduced this distinction. I understand the concept itself, at least superficially, but I am asking who introduced it.
There is a Rashi on the ten commandments that uses the phrase `ben adam lechavero', but not in contrast in ben adam lemakom. I remember learning about in primary school, but I can't find a source for it.
Various sources say things like
The Sages, for whom the world could be seen as a web of relationships, distinguished between mitzvot Bein Adam LaMakom (between a person and God, such as the commandments concerning Shabbat and prayer) and the mitzvot Bein Adam LeChavero (between people, such as the laws concerning business practices, marriage, divorce, and so on).
The mitzvot commanded to the Jewish people are usually described are falling into one of two categories: Bein Adam LaMakom (between man and G-d) and Bein Adam LeChavero (between man and his fellow man).
After some searching the internet all I can find is a generic 'rabbis', but no specific sources.`