Matthew 14:3-4
3 Before that, Herod had commanded his soldiers, ‘Take hold of John. Tie his hands and feet and put him in prison.’ Herod had done this because of his wife Herodias. Before Herod married her, she was the wife of Herod's brother Philip. 4 John had said to Herod, ‘Herodias was your brother's wife. So it is not right for you to have her as your wife.’
14:4Herodias had left Philip, her husband. Then Herod married her. God's Law said, ‘A man must not marry his brother's wife.’ See Leviticus 20:21. Herod was angry with John when he told him that. 