John Mark
Mark 6:18BSB·traditional attribution

For John had been telling Herod, “It is not lawful for you to have your brother’s wife!”

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The wild notions that the people had concerning our Lord Jesus, Mar 6:15. His own countrymen could believe nothing great concerning him, because they knew his poor kindred; but others that were not under the power of that prejudice against him, were yet willing to believe any thing rather than the truth - that he was the Son of God, and the...

Commenting on Mark 6:14-29

John Gill Reformed Baptist @doctorgill

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 Mat 14:4.