Matthew 5:28

but I tell you, that every one who looks on a woman to desire her inordinately, has already committed adultery with her in his heart.

Matthew 12:35

The good man, out of his good treasury, casts forth good things; and the evil man, out of his evil treasury, casts forth evil things.

Matthew 15:19

For from the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false testimonies, blasphemies:

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
but I tell you, that every one who looks on a woman to desire her inordinately, has already committed adultery with her in his heart.
Matthew 12:35
The good man, out of his good treasury, casts forth good things; and the evil man, out of his evil treasury, casts forth evil things.
Matthew 15:19
For from the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false testimonies, blasphemies: