Ibn Ezra

Therefore (עַל־כֵּן - al ken): This refers back [to the previous verse, indicating the consequence of being like chaff]: that the souls of the wicked will perish, and the memory of their descendants in this world [will also perish]. Therefore, the word "will not stand" (lo yakumu) means they will not endure (ya'amdu). In the judgment (בַּמִּשְׁפָּ֑ט - ba-mishpat): This is similar to (Ecclesiastes 12:14): "For God shall bring every work into judgment (be-mishpat)." [Regarding the grammatical form ba-mishpat:] The bet [prefix] has a patach vowel, [which may be noted] to indicate [their] lack of knowledge/understanding [that leads them to this judgment]. This usage is similar in structure to (Psalm 36:6): "O Lord, Your kindness is in the heavens (be-ha-shamayim)." [This is applicable] because it is the Day of Judgment (Yom HaDin) for everyone [together] on a single day, or [alternatively] for each individual at the time of their death. In the assembly of the righteous (בַּעֲדַ֥ת צַדִּיקִֽים - ba'adat tzaddikim): [Sinners will not stand there] because their [the righteous'] association (hitchabrutam - their joining together) is beneficial for all of them, the opposite of the company (chaburat) of the wicked.