MAT 14:3

3 The reason [Herod thought that was this: Herod had married] Herodias, the wife of his brother Philip, [while Philip was still living. So] John had been saying to him, “[What] you [did by] marrying [your brother’s wife while your brother is still alive is against God’s] law!” Then, to [please] Herodias, Herod [told his soldiers] to arrest John. They bound him with chains and put him in prison.