John Calvin on Acts 23:30-31

30. When it was showed to me. The second part of the epistle where the chief captain doth bring the adversaries into contempt, “Odium in adversarios retorquet,” retorts upon his adversaries their hatred. because they went about to kill Paul treacherously. Whence it is also gathered, that they trouble Paul unjustly, and that they sought so sore against his life without any cause. For if they had persecuted him lawfully, they would have trusted to the goodness of their cause, and not have suffered him to be judged according to law. Now, when as they seek to kill him, it appeareth that they have no reason.