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Very good point. Why should you believe me, as opposed to the people who translated the King James, etc.? Well, it's simple.
There is an Oral Tradition (a.k.a., the Oral Torah) that explains and elucidates the Written Torah (i.e., the 5 Books of Moses). The Written Torah is incomprehensible and illogical without it. The best analogy that I like to use is that the Written Torah is the tip of the iceberg above the water, the Oral Torah the great mass below. The link below is a very good detailed explanation:
http://www.aish.com/literacy/concepts/The_Oral_Tradition.asp
BTW, the Pharisees were the ones responsible for maintaining the Oral Tradition through years of persecution.