The phrase "prophetic voice" refers to someone who speaks with great insight and wisdom about the future or important truths. They have a special ability to predict or inspire positive change. Full definition
You need to have prophetic voices in your life to speak truth that you likely don't want to hear. (relevantmagazine.com)
The most powerful way for faith and spiritual communities to influence beliefs, norms and institutions is through prophetic voice and public action. (religion-online.org)
Another goal is «a strong prophetic voice of the Christian community in America.» (firstthings.com)