What is an agreement between man and God?

In The Bible, such agreements are called covenants.
An example of such a covenant is the Mosaic Law covenant, of which, the Ten Commandments were the most famous part of that law covenant. That agreement consisted of about 300 requirements, and the agreement was between the Jewish nation of Israel and their God.

There are other religions that have their own concepts of agreements/covenants between men and their respective Gods. Some religions state that there were men and women who were given pledges or promises; they received boons from their respective Gods. The various different religions and cultures had their own descriptions for these compacts between men and their God. Some religions claim that their God made various covenants with individuals to be born as a son, daughter, brother, wife, husband etc. It is also acclaimed that God made covenants with individuals to protect or save them from the wrath of demonic individuals.