Don't be that dumb! Im talking about the New Testament .... Letters written by the apostles and disciples, they were there with Jesus .... They walked with him for the 3 years leading up to his death on the cross .... The Old Testament was also written by men who had revelations by God and were witness to his miracles ..... All of these which are recorded by many other people around that time as well backing up what was said by just the disciples. So it just isn't one person saying something .... It was multiple people who were considered scholars back then and Kings who documented these accounts.