Joseph Benson's Commentary of the Old and New Testaments - John 21:16-17
John 21:16-17. He saith unto him again the second (and even the third) time, Simon, &c., lovest thou me? Doubtless with a view to impress the importance of the question with the greater force on his mind; and perhaps, also, to remind Peter of his having thrice denied him, and thereby given him cause to question the sincerity of his love. But at these two latter times, Christ leaves out the words more than these: because Peter, in his answer, had modestly left them out. Observe,... read more
Albert Barnes' Notes on the Whole Bible - John 21:17
The third time - It is probable that Jesus proposed this question three times because Peter had thrice denied him. Thus he tenderly admonished him of his fault and reminded him of his sin, while he solemnly charged him to be faithful and vigilant in the discharge of the duties of the pastoral office. The reason why the Saviour addressed Peter in this manner was doubtless because he had just denied him - had given a most melancholy instance of the instability and weakness of his faith, and of... read more