How do we know Peter was forgiven after his denial?

The evidence of Peter's forgiveness is seen after the resurrection when an angel instructs the women to tell 'His disciples and Peter' that Jesus has risen (Mark 16:7). This personal mention underlines the grace extended to Peter after his failure. Furthermore, Jesus' appearance to Peter as recorded in 1 Corinthians 15:5 confirms the individualized attention given to him. The Lord's question to Peter three times in John 21, 'Do you love me?' and His subsequent restoration of Peter to ministry work signify that God’s grace not only forgives but also reinstates His followers into fellowship and service, regardless of past failings.