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What was the sin whereby our first parents fell from the estate wherein they were created?
The sin whereby our first parents fell from the estate wherein they were created, was their eating the forbidden fruit.
Scripture Proofs
Genesis 3:6
She took of the fruit thereof, and did eat, and gave also unto her husband with her; and he did eat.
Genesis 3:12-13
The woman whom thou gavest to be with me, she gave me of the tree, and I did eat.