'Undoing' in the Bible

it is impossible, I say, to keep bringing them back to a new repentance, for, to their own undoing, they are repeatedly crucifying the Son of God afresh and exposing Him to open shame.

For you know that even afterwards, when he wished to secure the blessing, he was rejected; for he found no opportunity for undoing what he had done, though he sought the blessing earnestly with tears.

He who is habitually guilty of sin is a child of the Devil, because the Devil has been a sinner from the very beginning. The Son of God appeared for the purpose of undoing the work of the Devil.