OET interlinear 2 COR 13:1

uW Translation Notes:

Note 1 topic: figures-of-speech / activepassive

ἐπὶ στόματος δύο μαρτύρων καὶ τριῶν σταθήσεται πᾶν ῥῆμα

(Some words not found in SR-GNT: Τρίτον τοῦτο ἔρχομαι πρός ὑμᾶς Ἐπί στόματος δύο μαρτυρῶν καί τριῶν σταθήσεται παν ῥῆμα)

If your language does not use the passive form in this way, you could state this in active form or in another way that is natural in your language. Alternate translation: [Only if two or three people have said the same thing about another person should God’s people believe that it is true]

ἐπὶ στόματος δύο μαρτύρων καὶ τριῶν σταθήσεται πᾶν ῥῆμα

(Some words not found in SR-GNT: Τρίτον τοῦτο ἔρχομαι πρός ὑμᾶς Ἐπί στόματος δύο μαρτυρῶν καί τριῶν σταθήσεται παν ῥῆμα)

Paul is quoting here from Deuteronomy 19:15. He has been accusing the Corinthian believers of doing wrong, and so he compares the number of his visits, during which he has observed and will observe this wrong behavior, with the number of witnesses that the Old Testament required for convicting someone of doing wrong. You may want to include some of this information in a footnote.

Note 2 topic: figures-of-speech / metonymy

ἐπὶ στόματος

(Some words not found in SR-GNT: Τρίτον τοῦτο ἔρχομαι πρός ὑμᾶς Ἐπί στόματος δύο μαρτυρῶν καί τριῶν σταθήσεται παν ῥῆμα)

Paul is using the term mouth to mean the words that people say by using their mouths. If it would be helpful in your language, you could use a more natural expression from your language or you could state the meaning plainly. Alternate translation: [by the word] or [on the testimony]