Mark 6:17-20

For Herod himself had sent forth and laid hold upon John, and bound him in prison for Herodias' sake, his brother Philip's wife: for he had married her. For John had said unto Herod, It is not lawful for thee to have thy brother's wife. Therefore Herodias had a quarrel against him, and would have killed him; but she could not: for Herod feared John, knowing that he was a just man and an holy, and observed him; and when he heard him, he did many things, and heard him gladly.