John 21:16 - Matthew Poole's English Annotations on the Holy Bible

Ver. 16,17. Divines here raise a question, why our Saviour propounds this question thrice to Peter. The most of the ancients agree, that it was because Peter had thrice denied him. Some say, it was to show his great love to his church, which he could not commit to Peter but after three inquiries if he truly loved him, who was the Lord of it. Others refer it to the three ways by which good pastors ought to feed the church; prayer, preaching, and a holy life. Others think, that it hath reference to the three flocks that Peter was to feed; the Jews in Judea, the Gentiles, the dispersed amongst the Gentiles.