It was the woman who was deceived. Paul says "woman," rather than "Eve," to emphasize sex rather than individual. Adam is representative of every male; Eve of every female. In them we see the different psychology between man and woman. Eve's sin was unbelief. She was deceived and broke God's law. Paul says Adam was not deceived. Note that God treats Eve's unbelief more severely than Adam's deliberate act (see Genesis 3:16).

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Old Testament