Leviticus chapter 4

After reading chapter 4:

*Here we have instructions for sin offerings. They are for when any Israelite, even a priest or ruler, sins unintentionally, and it becomes known. Sin is defined as going against any of Yahweh's commandments concerning things which ought not be done. The animal being offered is to be slaughtered in the usual way. This time a priest performs different rituals with the blood. Then the fatty parts of the animal are burnt. The rest of the animal is taken to a special place outside camp and burnt. Then their sins will be forgiven.

*So, Yahweh makes the rules and decides what must be done when the rules are broken, in order for him to forgive the offenders. I imagine it was necessary to set up a system of forgiveness so that he didn't end up annhilating  his worshippers, since the punishment for so many sins was death. Without the Israelites he would become obsolete, just like many other ancient gods.

Edited.