Key @ frequently mentioned in Scripture. It is called in Hebrew _maphteah_, i.e., the opener Judges:3:25); and in the Greek New Testament _kleis_, from its use in shutting Matthew:16:19; Luke:11:52; Revelation:1:18, etc.). Figures of ancient Egyptian keys are frequently found on the monuments, also of Assyrian locks and keys of wood, and of a large size (comp. Isaiah:22:22). The word is used figuratively of power or authority or office Isaiah:22:22; Revelation:3:7; Revelation:1:8; comp. 9:1; 20:1; comp. also Matthew:16:19Matthew:18:18). The "key of knowledge" Luke:11:52; comp. Matthew:23:13) is the means of attaining the knowledge regarding the kingdom of God. The "power of the keys" is a phrase in general use to denote the extent of ecclesiastical authority.