Revelation 11:3; Revelation 12:6; Revelation 13:18

3 "And I will grant authority to my two witnesses, and they will prophesy for twelve hundred and sixty days, clothed in sackcloth."

6 Then the woman fled into the wilderness where she had a place prepared by God, so that there she would be nourished for one thousand two hundred and sixty days.

18 Here is wisdom. Let him who has understanding calculate the number of the beast, for the number is that of a man; and his number is six hundred and sixty-six .