Matthew 12:34-35
Offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart the mouth speaks.
Luke 6:45
The good man out of the good treasury of his heart brings forth good, and the evil man out of the evil brings forth evil; for out of the abundance of the heart its mouth speaks.
Matthew 15:19
For from the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false testimonies, blasphemies:
Mark 7:21-23
for from within, from the hearts of men, proceed evil thoughts, fornications,
Mark 14:38
Watch and pray that you enter not into trial; the spirit indeed is willing, but flesh is weak.
Hebrews 12:15
taking care that no one may come short of the grace of God, that no root of bitterness springing up may make trouble and by it many be defiled,
James 1:14-15
But every one is tempted when he is drawn away by his desires, and enticed;