Son of Nathan (1 Kings 4:5). Priest (kohen, KJV "principal officer") and "king's friend" to Solomon, i.e. privy councillor, i.e. confidential adviser, of the king.
Bibliography Information Fausset, Andrew Robert M.A., D.D., "Definition for 'Zabud' Fausset's Bible Dictionary". bible-history.com - Fausset's; 1878.