The text is a paraphrase of a historical phrase attributed to Papal legate Arnaud Amalric during the Albigensian Crusade, 'Caedite eos. Novit enim Dominus qui sunt eius,' which translates to 'Kill them. For the Lord knows those that are His.' It does not play on the different meanings of a word or similar-sounding words, but rather conveys a message about leaving judgment to a higher power.
Kill them all ! . . . . Let God sort them out .