17 For Herod himself had sent forth and laid hold upon John, and bound him in prison for the sake of Herodias, his brother Philip's wife; for he had married her. 18 For John said unto Herod, It is not lawful for thee to have thy brother's wife. 19 And Herodias set herself against him, and desired to kill him; and she could not; 20 for Herod feared John, knowing that he was a righteous and holy man, and kept him safe. And when he heard him, he was much perplexed; and he heard him gladly.
Matthew Henry's Commentary on Mark 6:17-20
Commentary on Mark 6:14-29
(Read Mark 6:14-29)
Herod feared John while he lived, and feared him still more when he was dead. Herod did many of those things which John in his preaching taught him; but it is not enough to do many things, we must have respect to all the commandments. Herod respected John, till he touched him in his Herodias. Thus many love good preaching, if it keep far away from their beloved sin. But it is better that sinners persecute ministers now for faithfulness, than curse them eternally for unfaithfulness. The ways of God are unsearchable; but we may be sure he never can be at a loss to repay his servants for what they endure or lose for his sake. Death could not come so as to surprise this holy man; and the triumph of the wicked was short.