The righteous shall rejoice when he seeth the vengeance: he shall wash his feet in the blood of the wicked.
The righteous shall rejoice when he seeth the vengeance - (Psalms 52:6; Psalms 107:42.) God's vindication of His righteousness shall fill the righteous with joy.
He shall wash his feet in the blood of the wicked - figuratively; not that the righteous avenge themselves (1 Samuel 24:12), but they identify themselves with God in His triumph over the ungodly (Revelation 19:14-15; Psalms 68:23).