Mt 21:28-31a
"What is your opinion? A man had two sons. He came to the first and said, 'Son, go out and work in the vineyard today.' He said in reply, 'I will not,' but afterwards he changed his mind and went. The man came to the other son and gave the same order. He said in reply, 'Yes, sir,' but did not go. Which of the two did his father's will?".
