Against an elder (κατα πρεσβυτερου). In the official sense of verses 1. Timothy 5:17.

Receive not (μη παραδεχου). Present middle imperative with μη (prohibition) of παραδεχομα, to receive, to entertain. Old verb. See Acts 22:18.

Accusation (κατηγοριαν). Old word (from κατηγορος). In N.T. only here, Titus 1:6; John 18:29 in critical text.

Except (εκτος ε μη). For this double construction see 1. Corinthians 14:5; 1. Corinthians 15:2.

At the mouth of (επ). Idiomatic use of επ (upon the basis of) as in 2. Corinthians 13:1.