John the Apostle
John 21:17BSB·traditional attribution

Jesus asked a third time, “Simon son of John, do you love Me?” Peter was deeply hurt that Jesus had asked him a third time, “Do you love Me?” “Lord, You know all things,” he replied. “You know I love You.” Jesus said to him, “Feed My sheep.

John Calvin Reformed @genevareformer

17. Peter was grieved. Peter undoubtedly did not perceive the object which Christ had in view, in putting the same question so frequently; and therefore he thinks that he is-in-directly accused, as if he had not answered with sincerity. But we have already showed that the repetition was not superfluous.

Matthew Henry Presbyterian @wholebiblehenry

We have here Christ's discourse with Peter after dinner, so much of it as relates to himself, in which, I. He examines his love to him, and gives him a charge concerning his flock, Joh 21:15-17. Observe, 1. When Christ entered into this discourse with Peter.

Commenting on John 21:15-19

John Gill Reformed Baptist @doctorgill

He saith unto him the third time,.... That by these three testimonies, out of his mouth, the thing might be established, and be out of all doubt: Simon, son of Jonas, lovest thou me? is it so indeed that thou lovest me? is thy love really so hearty and sincere as thou savest? may it be depended upon?