Commentaries:
Barnes' Notes
Then came Peter ... - The mention of the duty Matthew 18:15 of seeing a brother when he had offended us, implying that it was a duty to forgive him, led Peter to ask how often this was to be done.
Forgive him - To forgive is to treat as though the offence was not committed - to declare that we will not harbor malice or treat unkindly, but that the matter shall be buried and forgotten.
Other Barnes' Notes entries containing Matthew 18:21:
Psalms 79:12
Daniel 9:24
Luke 17:3-4
Colossians 3:13
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