Matthew 5:28

I, however, say to you that any one who looks at a woman with an impure intention has already committed adultery with her in his heart.

Matthew 12:35

A good man, from his good stores, produces good things; while an evil man, from his evil stores, produces evil things.

Matthew 15:19

For out of the heart proceed evil thoughts--murder, adultery, unchastity, theft, perjury, slander.

Treasury of Scripture Knowledge

Summary

And let none of you imagine evil in your hearts against his neighbour; and love no false oath: for all these are things that I hate, saith the LORD.

Bible References

Let

Matthew 5:28
I, however, say to you that any one who looks at a woman with an impure intention has already committed adultery with her in his heart.
Matthew 12:35
A good man, from his good stores, produces good things; while an evil man, from his evil stores, produces evil things.
Matthew 15:19
For out of the heart proceed evil thoughts--murder, adultery, unchastity, theft, perjury, slander.