keys in the Bible
Keys are frequently mentioned in Scripture. It is called in Hebrew maphteah, i.e., the opener (Judg. 3:25); and in the Greek New Testament kleis, from its use in shutting (Matt. 16:19; Luke 11:52; Rev. 1:18, etc.).
Figures of ancient Egyptian keys are frequently found on the monuments of Egypt, also of Assyrian locks and keys of wood, and of a large size. The earliest lock and key device was found in Nineveh. Lock boxes with keys were commonly used by affluent ancient Romans.
Keys to the Kingdom of Heaven
“And I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven.” —Matthew 16:19 NKJV (compare Matt. 18:18)
Key of the House of David
“Then I will set the key of the house of David on his shoulder, When he opens no one will shut, When he shuts no one will open.” —Isaiah 22:22 NASB
In the above verse, the word key is used figuratively of power or authority or office, as it is in…
“And to the angel of the church in Philadelphia write, ‘These things says He who is holy, He who is true, “He who has the key of David, He who opens and no one shuts, and shuts and no one opens” —Rev. 3:7 NKJV
Key to the bottomless pit
Then I saw an angel coming down from heaven, having the key to the bottomless pit and a great chain in his hand. —Rev. 20:1 NKJV
Key of knowledge
Power of the keys
The “power of the keys” is a phrase in general use to denote the extent of ecclesiastical authority.