The phrase "prophetic witness" refers to speaking out boldly and fearlessly about important moral or ethical issues. It involves sharing wisdom and insight with others in order to inspire change and make a positive impact on society. Full definition
I had anticipated a powerful prophetic witness and was given a keen lesson in wisdom. (religion-online.org)
They constitute an important channel of the church's prophetic witness today. (religion-online.org)
In a CNN interview with Anderson Cooper after recent events in Charlottesville, Virginia, where the violent protests concerning the removal of the Robert E. Lee statue led to the loss of three lives, West reflected, «We are dealing with the life and death of the American democratic experiment, what I mean by that is the spiritual blackout, the eclipse of honesty and integrity; moral meltdown where there's no space for prophetic witness of love and justice.» (gse.harvard.edu)