1 Corinthians 9:27 but I chastise my body, and bring 'it' into servitude, lest by any means, having preached to others -- I myself may become disapproved. (See NAS RSV NIV)
2 Corinthians 13:5 Test your own selves, whether you are in the faith. Test your own selves. Or don't you know as to your own selves, that Jesus Christ is in you?-unless indeed you are disqualified. (WEB)
2 Corinthians 13:6 But I hope that you will know that we aren't disqualified. (WEB)