Mark 6:18-20
18 For John had been saying to Herod, “It is not lawful for you to have your brother’s wife.”
19 So Herodias nursed a grudge against John and wanted to kill him. But she was not able to,
20 because Herod feared John and protected him, knowing him to be a righteous and holy man. When Herod heard John, he was greatly puzzled; yet he liked to listen to him.