John Gill Commentary Psalms 64:8

"So they shall be made to stumble, their own tongue being against them: All that see them shall wag the head." — Psalms 64:8 (ASV)

So shall they make their own tongue to fall upon themselves ,
&c.] The evil things they have wished for, threatened unto, and imprecated on others, shall come upon themselves; the curses they have cursed others with shall come upon themselves; the pit they have dug for others, they fall into. So Haman, to whom some apply the psalm, was hanged on the gallows he made for Mordecai; and the accusers of Daniel, to whom others apply it, were cast into the same den of lions they procured for him; and Babylon, who has been drunk with the blood of the saints, shall have blood given her to drink.

all that see them shall flee away ;
not being able to help them, nor to bear the horrible sight, and fearing the same judgments should fall on themselves; see (Numbers 16:34) (Revelation 18:10Revelation 18:15) .

Or, "they shall move themselves" ^F4 ; shake their heads in a way of derision, as Jarchi interprets it; or skip for joy, as the word is rendered in (Jeremiah 48:27) ; and then it must be understood of the righteous; who, seeing the vengeance on the wicked, rejoice, as in (Psalms 52:6) (58:10) ; though, as they are afterwards particularly mentioned, others seem to be designed. The word is used for lamenting and bemoaning one's self, in (Jeremiah 31:18) ; and so may be applied to the friends of the wicked lamenting and bemoaning their ruin, and their being bereaved of them, (Revelation 18:9Revelation 18:11) .

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FOOTNOTES:

• F4: (wrdwnty) "amovebunt se", Montanus; "commovebuntur", Vatablus.