Exodus 9:7
And Pharaoh sent, and, behold, there was not one of the cattle of the Israelites dead. And
the heart of Pharaoh was hardened, and he did not let the people go.
Mark 7:20-23
And he said, That which cometh out of the man, that defileth the man.
For
from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness:All these evil things come from within, and defile the man.
1 Samuel 16:7
But the LORD said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for the LORD seeth not as man seeth; for man looketh on the outward appearance, but the LORD looketh on the heart.
Matthew 13:15
For this people's heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes and hear with their ears, and should
understand with their heart, and should be converted, and I should heal them.
Matthew 12:34
O generation of vipers, how can ye, being evil, speak good things? for
out of the abundance of the heart the mouth speaketh.
Ezekiel 18:31
Cast away from you all your transgressions, whereby ye have transgressed; and make you a new heart and a new spirit: for why will ye die, O house of Israel?
Ezekiel 36:26
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
Mark 3:5
And when he had looked round about on them with anger, being grieved for the hardness of their hearts, he saith unto the man, Stretch forth thine hand. And he stretched it out: and his hand was restored whole as the other.