Here are 7 Bible verses about evil hearts from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Matthew 15:19 KJV
For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
Matthew 15:8 KJV
This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me.
Daniel 4:16 KJV
Let his heart be changed from man’s, and let a beast’s heart be given unto him; and let seven times pass over him.
Titus 1:15 KJV
Unto the pure all things are pure: but unto them that are defiled and unbelieving is nothing pure; but even their mind and conscience is defiled.
Colossians 2:18 KJV
Let no man beguile you of your reward in a voluntary humility and worshipping of angels, intruding into those things which he hath not seen, vainly puffed up by his fleshly mind,
Jeremiah 17:9 KJV
The heart is deceitful above all things, and desperately wicked: who can know it?
Romans 1:28 KJV
And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;