Door of Time
From Zelda Dungeon Wiki
The door of time is a giant stone door that separates the chamber of the Master Sword from the main hall inside of the Temple of Time. In order to open this ancient door so Link can gain access to the Pedestal of Time where the Master Sword rests, he must collect the three Spiritual Stones of Forest, Fire, and Water and place them on the altar inside the Temple of Time.
