testify

todistaa To make a declaration, or give evidence, under oath.
2014, (w), "http://www.theguardian.com/society/2014/aug/29/-sp-untold-story-culture-of-shame-ruzwana-bashir The untold story of how a culture of shame perpetuates abuse. I know, I was a victim", The Guardian, 29 August 2014:

It was only after a decade away from Skipton that I was finally able to garner the courage to return and testify against my abuser.

One witness shall not testify against any person to cause him to die.

We speak that we do know, and testify that we have seen; and ye receive not our witness.