The use of this term in the early church was a marker of the new family relationship that exists amongst believers in Christ who call on one Father (Acts 15:25; Romans 1:7; 1 Corinthians 4:17; Ephesians 5:1).1 Peter uses this term repeatedly in the final section of his letter to distinguish between believers and false teachers.
14 Therefore, beloved, since you are waiting for these, be diligent to be found by him without spot or blemish, and at peace.