Mark 6:17-19

Young's Literal Translation

¹⁷ For Herod himself, having sent forth, did lay hold on John, and bound him in the prison, because of Herodias the wife of Philip his brother, because he married her,

¹⁸ for John said to Herod -- `It is not lawful to thee to have the wife of thy brother;'

¹⁹ and Herodias was having a quarrel with him, and was willing to kill him, and was not able,