μαρτυροποιέω
From LSJ
Ἀμήχανον δὲ παντὸς ἀνδρὸς ἐκμαθεῖν ψυχήν τε καὶ φρόνημα καὶ γνώμην πρὶν ἂν ἀρχαῖς τε καὶ νόμοισιν ἐντριβὴς φανῇ → It is impossible to know the spirit, thought, and mind of any man before he be versed in sovereignty and the laws
English (LSJ)
A produce evidence, PLips.40 iii 14 (iv/v A.D.), Gloss.: —also in Med., call to witness, Corn.ND16. II mostly in Med., testify, certify on oath, IG9(1).61.8 (Daulis, ii A.D.), Mitteis Chr.242.3 (ii A.D.), Sammelb.5217.20 (ii A.D.), etc.