18For John had said unto Herod, It is not lawful for thee to have thy brother’s wife.

 19Therefore Herodias had a quarrel against him, and would have killed him; but she could not:

 20For 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. (Mark 6:18-20, King James Version)