What does Psalm 63:11 mean?

David was forced to evacuate Jerusalem, through the wilderness, during Absalom's rebellion (2 Samuel 15:13–14; 17:2, 27–29). That experience brought to mind ideas such as thirst and danger, which David used in the opening lines of this song (Psalm 63:1–6). Because the situation involves traitors and rebels, David makes a point of referring to "the king," meaning himself. This demonstrates his confidence in God's promise to give him the throne of Israel and grant him a long life (2 Samuel 7:11–12).

Those loyal to David, and to the Lord, would celebrate when his rule was secured. However, those who lied and betrayed David would not rejoice. Much of Absalom's rebellion involved propaganda and crafty half-truths (2 Samuel 15:1–6, 10–12). David's assurance here is that those lies would be stopped, by God Himself. This is consistent with God's overall condemnation of lies and those who wield them. Revelation 21:8 says, "But as for the cowardly, the faithless, the detestable, as for murderers, the sexually immoral, sorcerers, idolaters, and all liars, their portion will be in the lake that burns with fire and sulfur, which is the second death."