Mark 6:17-20

For Herod himself had given orders to arrest John and to chain him in prison on account of Herodias, his brother Philip’s wife, because he had married her. John had been telling Herod, “It is not lawful for you to have your brother’s wife.” So Herodias held a grudge against him and wanted to kill him. But she could not, because Herod feared John and protected him, knowing he was a righteous and holy man. When Herod heard him he would be very perplexed, and yet he liked to listen to him.