Extended Strong's Greek Lexicon (Abbott-Smith based)
to testify against
Usage: κατα-μαρτυρέω, -ῶ [in LXX: Job.15:6, Pro.25:18 (עָנָה), al. ;] to bear witness againt: with accusative of thing(s) and genitive of person(s), Mat.26:62 27:13, Mrk.14:60.† (AS)