The two witnesses are two of God's prophets who are seen in a vision by John of Patmos, who appear during the Second woe in the Book of Revelation 11:1-14.
The two witnesses have been variously identified by theologians as two individuals, as two groups of people, or as two concepts. Dispensationalist Christians believe that the events described in the Book of Revelation will occur before and during the Second Coming of Christ and attempt to associate references in the Book of Revelation with historical or current happenings and people.
John is told that the court of God's temple would be trampled on by the nations for 42 months. During that period for 1,260 days (or 42 months, or 3½ years), two witnesses would be granted authority to prophesy. They are described as two olive trees and two lampstands who stand before the Lord of the earth. Both are able to devour their enemies with fire that flows out of their mouths. Also, they have power over the sky and waters and are able to strike the earth with plague.
After their testimony, the Beast overcomes the two witnesses and kills them. For three and a half days, the people of the earth celebrate the two witnesses' death (who have tormented them for three and a half years) and will not permit the witnesses a proper burial. After this time, God resurrects the two witnesses; their resurrection strikes fear on everyone witnessing their revival, and the two witnesses then ascend to heaven. In the next hour, a great earthquake occurs and kills 7000 men, destroying a tenth of the city.
According to the text, the two witnesses are symbolised as the "two olive trees and the two lampstands" that have the power to destroy their enemies, control the weather and cause plagues. Their description as "two olive trees and two lampstands" may be symbolism, allegory, or literal.
In attempting to exegete Revelation 11, commentators who hold to a premillennial eschatology generally interpret the two witnesses in one of three ways: (1) as individuals either manifested in some form of reincarnation; or "in the spirit" of biblical prophets who once appeared in Bible history; or simply as two individuals newly arrived on the earth; (2) as corporate in nature (human) standing for the Church only or for Israel only; or both Israel and the Church; or for both Jewish and Gentiles believers in Jesus; or (3) as symbolism or an expression of biblical concepts (i.e., the Old and New Testaments; the Law and the Prophets; Mercy and Grace).