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Genesis 6:5
Then the LORD saw that the wickedness of man was great in the earth, and that every intent of the thoughts of his heart was only evil continually.
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Hebrews 3:12
Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God;
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Matthew 15:18-19
But those things which proceed out of the mouth come from the heart, and they defile a man. For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies.