john 21:17 He saith unto him the third time, Simon, son of Jonas, lovest thou me? Peter was grieved because he said unto him the third time, Lovest thou me? And he said unto him, Lord, thou knowest all things; thou knowest that I love thee. Jesus saith unto him, Feed my sheep. - Free Bible Online

      17. He saith unto him the third time, Simon, son of Jonas, lovest thou me? Peter was grieved because he said the third time, &c.--This was the Physician's deepest incision into the wound, while yet smarting under the two former probings. Not till now would Peter discern the object of this succession of thrusts. The third time reveals it all, bringing up such a rush of dreadful recollections before his view, of his "thrice denying that he knew Him," that he feels it to the quick. It was fitting that he should; it was meant that he should. But this accomplished, the painful dialogue concludes with a delightful "Feed My sheep"; as if He should say, "Now, Simon, the last speck of the cloud which overhung thee since that night of nights is dispelled: Henceforth thou art to Me and to My work as if no such scene had ever happened."

JFB.