hidden knowledge

According to the Islamic and Quranic teachings, the Prophets and infallible Imams (A) have access to the knowledge of unseen and it is possible for the Prophets and their infallible successors to acquire such a knowledge.

 Referring to the holy Quran it becomes clear that the prophets know some of the unseen things and events; thus, no one can reject totally the possibility of such knowledge for the prophets. 

 قال الباقر علیه السلام

Hidden knowledge as a Quranic term is only for Allah but there is a kind of knowledge which Allah shares with particular groups.