When most people hear the word "prophet," they think of someone who predicts the future. In Judaism, a prophet (navi) is something more radical: a person seized by God's spirit who speaks truth to power.
The Hebrew prophets are the most passionate voices for social justice in the ancient world. They denounce wealthy elites who exploit the poor. They condemn religious rituals performed by people who cheat their neighbors. They insist that God cares more about how you treat the vulnerable than about how many sacrifices you offer.
The prophetic books of the Hebrew Bible span roughly 300 years (8th-5th centuries BCE) and include towering figures: Isaiah, who saw God's glory in the Temple and proclaimed a vision of universal peace; Amos, a shepherd who declared that God demands justice, not sacrifice; Micah, who distilled all of religion into three requirements: do justice, love mercy, walk humbly with your God.
The prophets are not comfortable reading. They are meant to disturb — to shatter complacency and call both individuals and nations to account.