Mark 6:18

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

Mark 6:18 Meaning and Commentary

Mark 6:18

For John had said unto Herod
He had been personally with him, and had plainly and freely told him of his sin, and faithfully reproved him for it; alleging what he had done was contrary to the law of God:

it is not lawful, for thee to have thy brother's wife:
(See Gill on Matthew 14:4).

Mark 6:18 In-Context

16 And Herod having heard, said -- `He whom I did behead -- John -- this is he; he was raised out of the dead.'
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,
20 for Herod was fearing John, knowing him a man righteous and holy, and was keeping watch over him, and having heard him, was doing many things, and hearing him gladly.
Young's Literal Translation is in the public domain.