17 For Herod himself had sent [guards] and had John arrested and shackled in prison because of 6:17 See note Matt 14:3.Herodias, the wife of his [half-] brother Philip, because he (Herod) had married her. [Matt 14:3; Luke 3:19] 18 For John had been saying to Herod, "It is not lawful [under Mosaic Law] for you to have your brother’s wife." [Lev 18:16; 20:21]