According to the Talmud, Obadiah is said to have been a convert to Judaism from Edom, a descendant of Eliphaz, the friend of Job. He is identified with the Obadiah who was the servant of Ahab, and was chosen to prophesy against Edom because he was himself an Edomite.
Obadiah is supposed to have received the gift of prophecy for having hidden the "hundred prophets" from the persecution of Jezebel. He hid the prophets in two caves, so that if those in one cave should be discovered those in the other might yet escape.
–Wikipedia