Mark 6:18 KJV
For John had said unto Herod, It is not lawful for thee to have thy brother’s wife.
Mark 6:16–20 KJV Chapter Context
16
But when Herod heard thereof, he said, It is John, whom I beheaded: he is risen from the dead.
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.