Adam Clarke on Psalms 58:10

The righteous shall rejoice when he seeth the vengeance - He shall have a strong proof of the Divine providence, of God's hatred against sinners, and his continual care of his followers.

He shall wash his feet in the blood of the wicked - This can only mean that the slaughter would be so great, and at the same time so very nigh to the dwelling of the righteous, that he could not go out without dipping his feet in the blood of the wicked. The Syriac, Vulgate, Septuagint, Ethiopic, Arabic, and Anglo-Saxon, read hands instead of feet. Every thing that is vindictive in the Psalms must be considered as totally alien from the spirit of the Gospel, and not at all, under our dispensation, to be imitated. If the passage above be really vindictive, and it certainly will admit of the interpretation given above, it is to be considered as not belonging to that state in which the Son of man is come, not to destroy men's lives, but to save.