Mark 6:18 in the King James Version
For John had said unto Herod, It is not lawful for thee to have thy brother’s wife.
Context
17 For Herod himself had sent out and arrested John and bound him in prison for the sake of Herodias, his brother Philip’s wife, for he had married her.
18 For John had said to Herod, “It is not lawful for you to have your brother’s wife.”
19 Herodias set herself against him and desired to kill him, but she couldn’t,