This verse is often misinterpreted as a blanket promise of earthly success and prosperity for any leader or believer who merely professes faith or takes oaths invoking God, ignoring its poetic context in David's wilderness flight from Absalom where it poetically anticipates divine vindication rather than material gain; it does not endorse casual swearing or guarantee political victory but contrasts the joy of the God-fearing with the judgment on deliberate deceivers opposing God's anointed.
Psalms 63:11
King James Version (1769)
11 But the king shall rejoice in God; every one that sweareth by him shall glory: but the mouth of them that speak lies shall be stopped.
Psalms 63:11 expresses David's unwavering confidence in God's justice amid personal peril, declaring that the righteous king will rejoice in God, those loyal to Him—swearing by His name in covenant faithfulness—will glory in His deliverance, while the deceitful mouths of enemies will be silenced, underscoring the ultimate triumph of truth over lies under God's sovereign rule.