John Gill Bible Commentary

And one of them smote the servant of the high priest,.... The person that drew his sword, and performed this daring action, not waiting for an answer from Christ, was Peter, and the high priest's servant, that he smote, was Malchus; both which we learn from Joh 18:10 and cut off his right ear; he aimed, no doubt, at his head, but missing his blow, took off his right ear. It is very likely, that this servant was very busy and forward to lay hold on Christ, and showed much virulence, and great malignity; and therefore Peter singled him out, and levelled his blow at him.