2 Peter 1:13-16

And it is only right that I should keep on reminding you as long as I live. For our Lord Jesus Christ has shown me that I must soon leave this earthly life, so I will work hard to make sure you always remember these things after I am gone. For we were not making up clever stories when we told you about the powerful coming of our Lord Jesus Christ. We saw his majestic splendor with our own eyes