Acts 23:13

πλείους τεσσεράκοντα, more than forty. Shewing the excited state of popular feeling at this moment among the Jews. They may have been prompted to this method of getting rid of the Apostle, because they had not the power of life and death any longer, and were not likely to procure Paul’s death at the hands of the Roman authorities, on any accusation connected with a religious question.

οἱ ταύτην τὴν συνωμοσίαν ποιησάμενοι, who had made this conspiracy. The middle voice, which is the best supported reading, is the most in accordance with classical usage. The Greeks use ποιεῖν to be a cause (to others) of anything, ποιεῖσθαι to bring about for oneself. So they say ποιεῖσθαι πόλεμον, εἰρήνηω, συμμαχίαν, when men procure the war, peace or alliance unto themselves.