That he should ask who it should be of whom he spake.--The better reading is, and saith unto him, Say who it is of whom He speaketh. St. Peter supposes that the disciple whom Jesus loved is more than any other in the confidence of his Master, and that he knew who was here referred to, and makes a sign to him to tell what he knew.
that he should ask who it should be of whom he spake: which he did not out of mere curiosity, but from an honest intention and pure zeal, that he, with the rest, might show their abhorrence of such a person, and avoid him; and do all that lay in their power to hinder him from putting his designs into execution, and that the innocent might be free from all suspicion.
(k) T. Bab. Beracot ib.