Parallel
Deuteronomy 19:15
Rahlfs Septuagint (1935) · Berean Standard Bible
οὐκ ἐμμενεῖ μάρτυς εἷς μαρτυρῆσαι κατὰ ἀνθρώπου κατὰ πᾶσαν ἀδικίαν καὶ κατὰ πᾶν ἁμάρτημα καὶ κατὰ πᾶσαν ἁμαρτίαν ἣν ἂν ἁμάρτῃ ἐπὶ στόματος δύο μαρτύρων καὶ ἐπὶ στόματος τριῶν μαρτύρων σταθήσεται πᾶν ῥῆμα
A lone witness is not sufficient to establish any wrongdoing or sin against a man, regardless of what offense he may have committed. A matter must be established by the testimony of two or three witnesses (note: Cited in Matthew 18:16 and 2 Corinthians 13:1).