666 will persecute and wage war against the christians during the "great tribulation".
Revelation 11: 7 And when they have finished their testimony, the beast that rises from the bottomless pit[a] will make war on them and conquer them and kill them, 8 and their dead bodies will lie in the street of the great city that symbolically[b] is called Sodom and Egypt, where their Lord was crucified. 9 For three and a half days some from the peoples and tribes and languages and nations will gaze at their dead bodies and refuse to let them be placed in a tomb, 10 and those who dwell on the earth will rejoice over them and make merry and exchange presents, because these two prophets had been a torment to those who dwell on the earth. 11 But after the three and a half days a breath of life from God entered them, and they stood up on their feet, and great fear fell on those who saw them. 12 Then they heard a loud voice from heaven saying to them, “Come up here!” And they went up to heaven in a cloud, and their enemies watched them. 13 And at that hour there was a great earthquake, and a tenth of the city fell. Seven thousand people were killed in the earthquake, and the rest were terrified and gave glory to the God of heaven. ESV
Revelation 11: 7 And when they have finished their testimony, the beast that rises from the bottomless pit[a] will make war on them and conquer them and kill them, 8 and their dead bodies will lie in the street of the great city that symbolically[b] is called Sodom and Egypt, where their Lord was crucified. 9 For three and a half days some from the peoples and tribes and languages and nations will gaze at their dead bodies and refuse to let them be placed in a tomb, 10 and those who dwell on the earth will rejoice over them and make merry and exchange presents, because these two prophets had been a torment to those who dwell on the earth. 11 But after the three and a half days a breath of life from God entered them, and they stood up on their feet, and great fear fell on those who saw them. 12 Then they heard a loud voice from heaven saying to them, “Come up here!” And they went up to heaven in a cloud, and their enemies watched them. 13 And at that hour there was a great earthquake, and a tenth of the city fell. Seven thousand people were killed in the earthquake, and the rest were terrified and gave glory to the God of heaven. ESV


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