Bible Dictionary
Key
A key was a device for opening a lock and, figuratively, a sign of authority or responsibility. Scripture speaks of keys connected with the kingdom, knowledge, death, Hades, and the abyss.
Biblical Usage
Scripture speaks of the key of David, the keys of the kingdom of heaven, the key of knowledge, the keys of death and Hades, and the key of the abyss. These expressions signify authority, access, or control.
Scripture References