The Lake of Fire is the Second Death

The term, "lake of fire" is found four times in the Bible, all in the book of Revelation.
Rev 19:20 NKJV™
Then the beast was captured, and with him the false prophet who worked signs in his presence, by which he deceived those who received the mark of the beast and those who worshiped his image. These two were cast alive into the lake of fire burning with brimstone.
Rev 20:10 NKJV™
The devil, who deceived them, was cast into the lake of fire and brimstone where* the beast and the false prophet [are]. And they will be tormented day and night forever and ever.
Rev 20:14 NKJV™
Then Death and Hades were cast into the lake of fire. This is the second death.
Rev 20:15 NKJV™
And anyone not found written in the Book of Life was cast into the lake of fire.
The Lake of Fire is the final destination of all evil once and for all. This will take place sometime in the future at the end of Christ's reign on earth. The Bible doesn't give the exact location, however, Jesus taught about this place many times. He referred to it as "Gehenna" (English transliteration of the Greek). The concept that Jesus used was the valley of Hinnon in Jerusalem. This was the garbage dump of the day. They didn't have waste management companies so they put all the garbage and even bodies of people who could not afford graves and burned them in this place. It basically burned 24/7. The perpetual fires of the garbage dump was what Jesus used to describe the eternal flames of hell (gehenna)
Gehenna or geenna represents the Hebrew Ge-Hinnom (the valley of Tophet) and a corresponding Aramaic word; it is found twelve times in the NT, eleven of which are in the Synoptic Gospels, in every instance as uttered by the Lord Himself. He who says to his brother, Thou fool (see under FOOL), will be in danger of "the hell of fire," Matt. 5:22; it is better to pluck out (a metaphorical description of irrevocable law) an eye that causes its possessor to stumble, than that his "whole body be cast into hell," Matt. 5:29; similarly with the hand, Matt. 5:30; in Matt. 18:8,9, the admonitions are repeated, with an additional mention of the foot; here, too, the warning concerns the person himself (for which obviously the "body" stands in chapter. 5); in ver. 8, "the eternal fire" is mentioned as the doom, the character of the region standing for the region itself, the two being combined in the phrase "the hell of fire," ver. 9. To the passage in Matt. 18, that in Mark 9:43-47, is parallel; here to the word "hell" are applied the extended descriptions "the unquenchable fire" and "where their worm dies not and the fire is not quenched." This is a reference to the last passage in Isaiah chapter 66. That God, "after He hath killed, hath power to cast into hell," is assigned as a reason why He should be feared with the fear that keeps from evil doing, Luke 12:5; the parallel passage to this in Matt. 10:28 declares, not the casting in, but the doom which follows, namely, the destruction (not the loss of being, but of well-being) of "both soul and body." In Matt. 23 the Lord denounces the scribes and Pharisees, who in proselytizing a person "make him two-fold more a son of hell" than themselves (Matt 23:15), the phrase here being expressive of moral characteristics, and declares the impossibility of their escaping "the judgment of hell," Matt. 23:33. In James 3:6 "hell" is described as the source of the evil done by misuse of the tongue; here the word stands for the powers of darkness, whose characteristics and destiny are those of "hell."
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Then Death and Hades were cast into the lake of fire. This is the second death. And anyone not found written in the Book of Life was cast into the lake of fire.
Rev. 20:14,15 NKJV™
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