Mark 6:17-20

For Herod himself had sent and had John arrested and bound in prison on account of Herodias, the wife of his brother Philip, because he had married her. For John had been saying to Herod, “It is not lawful for you to have your brother’s wife.” Herodias had a grudge against him and wanted to put him to death and could not do so; for Herod was afraid of John, knowing that he was a righteous and holy man, and he kept him safe. And when he heard him, he was very perplexed; but he used to enjoy listening to him.