John Gill Bible Commentary

So shall they make their own tongue to fall upon themselves,.... 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 Num 16:34. Or, "they shall move themselves" (d); shake their heads in a way of derision, as Jarchi interprets it; or skip for joy, as the word is rendered in Jer 48:27; and then it must be understood of the righteous; who, seeing the vengeance on the wicked, rejoice, as in Psa 52:6; though, as they are afterwards particularly mentioned, others seem to be designed. The word is used for lamenting and bemoaning one's self, in Jer 31:18; and so may be applied to the friends of the wicked lamenting and bemoaning their ruin, and their being bereaved of them, Rev 18:9. (d) "amovebunt se", Montanus; "commovebuntur", Vatablus.