The Second Epistle of Peter was also written by the apostle Peter in the middle of the first century. It warns of false teachers who had come into the Early Church and urges Christians to be brave and patient.

2 Peter 3

3:9 The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.