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and as a result this was original sin
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and they were kicked out of the Garden of Eden.
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From then on for things they had to work.
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They also became subject to disease and to death.
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They were immortal until that time.
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So, we see in Genesis the embodiment of this idea
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that diseases are a punishment of sin.
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This was also clear--you can read further in the Bible,
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in the book of Exodus,
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where you learn about the bondage of the Israelites in Egypt
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and God asking for Moses and Aaron
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for the Pharaoh to release his chosen people.