Matthew 15:19

For out of the heart proceed wicked disputings, murders, adulteries, fornications, thefts, false-witnessings, slanders:

Acts 8:22

Repent therefore of this thy wickedness, and pray to God, if so be the thought of thine heart may be forgiven thee:

Matthew 5:28

but I tell you, that whosoever looketh on a woman, so as to lust after her, hath already debauched her in his heart.

Matthew 9:4

said to them, Why think ye evil in your hearts?

2 Corinthians 10:5

destroying false reasonings, and every height that is exalted against the knowledge of God, and captivating every thought to the obedience of Christ.

Treasury of Scripture Knowledge

Summary

The thought of foolishness is sin: and the scorner is an abomination to men.

Bible References

Thought

Matthew 5:28
but I tell you, that whosoever looketh on a woman, so as to lust after her, hath already debauched her in his heart.
Matthew 9:4
said to them, Why think ye evil in your hearts?
Matthew 15:19
For out of the heart proceed wicked disputings, murders, adulteries, fornications, thefts, false-witnessings, slanders:
Acts 8:22
Repent therefore of this thy wickedness, and pray to God, if so be the thought of thine heart may be forgiven thee:
2 Corinthians 10:5
destroying false reasonings, and every height that is exalted against the knowledge of God, and captivating every thought to the obedience of Christ.