# But I say to you
See how you translated this in Matthew 5:22.

# everyone who looks on a woman to lust after her has already committed adultery with her in his heart
This teaches that a man who lusts after a woman is as guilty of adultery as a man who actually commits the act of adultery.

# to lust after her
“and lusts after her” or “and desires to sleep with her”

# in his heart
Here “heart” is used to refer to a person’s thoughts. Alternate translation: “in his mind” or “in his thoughts”