Talking about the knowledge, Al- Qur‟an also mentioned lot of discussion about knowledge. One of them is the process of truth finding in Mūsa and Hidhir story on QS. al-Kahfi verse 60-82. Even it does not mention the name of Mūsa‟s interlocutor; but he called as “pious servant of God.” Majority of Muslim scholar argue, man who called by the pious servant of God is Hidhir. This story mentioned in QS. Al-Kahfi verse 60-82. Generally, this story tell about truth finding, where Musa, as Allah command, learn to Hidir About new knowledge that never been gained by Musa. Through epistemological approach, this story can be understood as an epistemological comparison between Musa‟s and Hidir‟s epistemology and the correlation between both of them.