Proverbs 24:9

For out of the heart come evil designs, murder, adultery, sexual vice, stealing, false witness, and slander.

So repent of this wickedness of yours, and ask God whether you cannot be forgiven for your heart's purpose.

But I tell you, any one who even looks with lust at a woman has committed adultery with her already in his heart.

Jesus saw what they were thinking and said, "Why do you think evil in your hearts?

Treasury of Scripture Knowledge

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

But I tell you, any one who even looks with lust at a woman has committed adultery with her already in his heart.

Jesus saw what they were thinking and said, "Why do you think evil in your hearts?

For out of the heart come evil designs, murder, adultery, sexual vice, stealing, false witness, and slander.

So repent of this wickedness of yours, and ask God whether you cannot be forgiven for your heart's purpose.