Matthew 12:33-35
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33"Either make the tree good, and its fruit good, or make the tree corrupt, and its fruit corrupt; for the tree is known by its fruit. 34You offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart, the mouth speaks. 35The good man out of his good treasure brings forth good things, and the evil man out of his evil treasure brings forth evil things.
Matthew 12:33-35 (WEB)