Six precepts were commanded to Adam:
a) the prohibition against worship of false gods;
b) the prohibition against cursing God;
c) the prohibition against murder;
d) the prohibition against incest and adultery;
e) the prohibition against theft;
f) the command to establish laws and courts of justice.
Even though we have received all of these commands from Moses and, furthermore, they are concepts which intellect itself tends to accept, it appears from the Torah's words that Adam was commanded concerning them.
The prohibition against eating flesh from a living animal was added for Noah, as Genesis 9:4 states: 'Nevertheless, you may not eat flesh with its life, which is its blood.' Thus there are seven mitzvot.
These matters remained the same throughout the world until Abraham. When Abraham arose, in addition to these, he was commanded regarding circumcision. He also ordained the morning prayers.
Isaac separated tithes and ordained an additional prayer service before sunset. Jacob added the prohibition against eating the sciatic nerve. He also ordained the evening prayers. In Egypt, Amram was commanded regarding other mitzvot. Ultimately, Moses came and the Torah was completed by him.