Bible Verses About Prophets: One generally attached to the king's household

When David got up in the morning, this word of ADONAI came to the prophet Gad, David's seer:

He stationed the L'vi'im in the house of ADONAI with cymbals, lyres and lutes, in keeping with the order of David, Gad the king's seer and Natan the prophet; for the mitzvah had come from ADONAI through his prophets.

The singers the sons of Asaf were at their posts, as ordered by David - Asaf, Heman and Y'dutun the king's seer. The gatekeepers were at every gate, and they did not need to leave their posts, because their brothers the L'vi'im prepared [food] for them.