It starts with Adam and Eve, God gave them one rule, not to eat from the tree of the knowledge of good and evil.
Satan in role of a serpent approached Eve to tempt her.
Now, many people don't know this so I will explain that a serpent back in the beggining of time was not like the snakes we see today.
A serpent looked like this:
He had two legs, and walked straight up and was highly intelligent.
Most people that do not beleive in God today say the Bible is a fairy tail but it's not, it's very real. Here's why, the reason why man could speak to animals before sin was brought into the world was because man was in what's called the shanaconna presence of The Lord, and Adam was made perfect in the image of God so he had total Dominion over the Earth and everything in it, so why wouldn't he be able to talk to the animals?
But, back to the orriginal plan of the devil, he tempted Eve, Eve fell for it and gave some to Eve.
The punishment was death.
But in the orriginal Greek Bible, it was translated die twice, meaning a physical and a spiritual death.
So the reslut for them was death.