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Because he didn't want Jesus to declare all foods clean;
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because in his Gospel Jesus teaches that
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Christians have to continue keeping the Law.
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Matthew has Jesus disagree with the scribes and Pharisees,
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but what he says here is that it's much more important sure,
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keeping kosher may be important but it's much more important
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what's going on in your heart and your mind,
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it's much more important what you say.
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So Jesus spiritualizes in a way or
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he again he intensifies the law and he's saying,
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yeah it's important to wash your hands perhaps
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but that's not a big deal.