Theophylact of Bulgaria
Peter wielded the knife, as noted by John (John 18:10). He had it in his possession, having recently offered the lamb that was consumed at the supper. We do not judge Peter harshly, for his actions were not for his own sake but in service to his Lord. Nevertheless, the Lord admonishes him against using the sword, despite Peter's intention to defend the divine cause. In severing the ear, Peter reveals the Jewish people's affliction of disobedience.