Mark 6:17-20 King James Version (KJV)
17 For Herod himself had sent forth and laid hold upon John, and bound him in prison for Herodias' sake, his brother Philip's wife: for he had married her.
18 For John had said unto Herod, It is not lawful for thee to have thy brother's wife.
19 Therefore Herodias had a quarrel against him, and would have killed him; but she could not:
20 For 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.