Mark 6:18-20

John had been telling Herod, “It is against God’s law for you to marry your brother’s wife.” So Herodias bore a grudge against John and wanted to kill him. But without Herod’s approval she was powerless, for Herod respected John; and knowing that he was a good and holy man, he protected him. Herod was greatly disturbed whenever he talked with John, but even so, he liked to listen to him.