17For Herod himself had ordered that John be arrested and bound and imprisoned, on account of his brother Philip’s wife Herodias, whom Herod had married.
18For John had been telling Herod, “It is not lawful for you to have your brother’s wife!”
— Mark 6:17-18

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Devo: What Jesus Did!

"For Herod had sent soldiers to arrest and imprison John as a favor to Herodias. She had been his brother Philip's wife, but Herod had married her...."