Psalms 64:8

8. Make their own tongue to fall upon themselves The evil which they had proposed to bring upon the righteous by false testimony and vile slander, shall be visited back upon themselves to their ruin. Psalms 7:16; Proverbs 12:13; Proverbs 18:7. “They were thinking of wounding the upright, but behold they are wounded themselves.” Hengstenberg.

All that see them shall flee As the people fled at the cry of Korah and his company when they saw them swallowed up alive. Numbers 16:34. But the word translated flee, signifies, radically, to move to and fro, to shake; and hence, also, to wag or shake the head in derisive triumph, as in Jeremiah 18:16; Jeremiah 48:27, in which latter it is translated in our English Bible, “skippedst for joy.” See also Psalm 14:14. So Furst translates the text, “All that look upon them shake [the head].” In this sense the looking upon them signifies, “the gratification of looking upon those who are justly punished, and rendered harmless.” Delitzsch. See Psalms 59:10; Psalms 92:11