Excellency.--Rather, height, carrying on the metaphor of preceding verse.
they delight in lies; in making and in spreading them, in order to hurt his character, and give his subjects an ill opinion of him; and thereby alienate their affections from him, and weaken their allegiance and obedience to him; see Revelation 22:15;
they bless with their mouth: saying, God bless the king, or save the king:
but they curse inwardly; they curse the king in their hearts, and when by themselves in private, when they imagine nobody hears them; see Ecclesiastes 10:20.
Selah; on this word; see Gill on Psalm 3:2.