μαρτυροποιέω
From LSJ
ὀψὲ θεῶν ἀλέουσι μύλοι, ἀλέουσι δὲ λεπτά → the millstones of the gods grind late, but they grind fine | the mills of God grind slowly, but they grind exceedingly small
English (LSJ)
A produce evidence, PLips.40 iii 14 (iv/v A.D.), Glossaria: —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.