What you have purposed in your heart to do; do! Do it with all your might and never look back; for what you left behind cannot be retrieved; whether blessing or cursing, it is gone never to be seen again.

“He answered and said, “He who dipped his hand with Me in the dish will betray Me. The Son of Man indeed goes just as it is written of Him, but woe to that man by whom the Son of Man is betrayed! It would have been good for that man if he had not been born.” Then Judas, who was betraying Him, answered and said, “Rabbi, is it I?” He said to him, “You have said it.” (Matthew 26:23-25, NKJV)
“Now after the piece of bread, Satan entered him. Then Jesus said to him, “What you do, do quickly.” (John 13:27)