לַעֲשׂ֤וֹת בָּהֶ֨ם ׀ מִשְׁפָּ֬ט כָּת֗וּב הָדָ֣ר ה֭וּא לְכָל־חֲסִידָ֗יו הַֽלְלוּ־יָֽהּ׃
To execute upon them the judgment written; He is the glory of all His saints. Hallelujah.
Read kabbalistic (mystical) interpretation of Psalms 149:9: and classical mystical sources.