'Prophet' in the Bible

All Israel from Dan to Beer-sheba knew that Samuel was confirmed as the LORD's prophet.

(Previously in Israel, a person would say when he went to inquire of God, "Come on! Let's go to the seer!" because the person known as a prophet today was formerly called a seer.)

The prophet Gad told David, "Don't remain in the stronghold. Go and enter the territory of Judah." So David left and went into the forest of Hereth.