What does Psalm 58:10 mean?

David expects the righteous people of Israel to rejoice when they see God's vengeance carried out on the wicked rulers and judges (Psalm 58:1–2). He has described these men as obstinate, willing sinners (Psalm 58:3–5) and made graphic appeals for the Lord to punish such men (Psalm 58:6–9). Here, the people are depicted in their response to God's vengeance. As with the earlier verses, this does not call on God-followers to take revenge. In these "imprecatory" psalms, there is no sense in which those praying are asking God to approve of their own actions. Instead, they are placing vengeance in the Lord's hands (Deuteronomy 32:35; Romans 12:19) and trusting Him to bring it about.

The imagery of bathing feet in blood is a reference to the aftermath of a battle. The idea is something so abundant that one cannot help but step in it (Job 29:6). In this case, David implies that God's wrath will be so great that God's people will walk through pools of the wicked men's blood (Psalm 68:23).

Aspects of this verse are echoed in the book of Revelation. Revelation 7:17 portrays Christ's comfort for His people This anticipation leads to immense praise (Revelation 19:6–7). Tears of sadness may flow now, but tears of joy will flow when Jesus judges the wicked. Some aspects of that judgment are brutally violent—though not the result of human efforts—and are also depicted as creating enormous amounts of blood (Revelation 14:20).