33:1-9 The prophet is a watchman to the house of Israel. His business is to warn sinners of their misery and danger. He must warn the wicked to turn from their way, that they may live. If souls perish through his neglect of duty, he brings guilt upon himself. See what those have to answer for, who make excuses for sin, flatter sinners, and encourage them to believe they shall have peace, though they go on. How much wiser are men in their temporal than in their spiritual concerns! They set watchmen to guard their houses, and sentinels to warn of the enemies' approach, but where the everlasting happiness or misery of the soul is at stake, they are offended if ministers obey their Master's command, and give a faithful warning; they would rather perish, listening to smooth things.
4. blood … upon his own head—metaphor from sacrificial victims, on the heads of which they used to lay their hands, praying that their guilt should be upon the victims.