isaiah 47:9 But these two things shall come to thee in a moment in one day, the loss of children, and widowhood: they shall come upon thee in their perfection for the multitude of thy sorceries, and for the great abundance of thine enchantments. - Free Bible Online

      9. in a moment--It should not decay slowly, but be suddenly and unexpectedly destroyed; in a single night it was taken by Cyrus. The prophecy was again literally fulfilled when Babylon revolted against Darius; and, in order to hold out to the last, each man chose one woman of his family, and strangled the rest, to save provisions. Darius impaled three thousand of the revolters.
      in . . . perfection--that is, "in full measure."
      for . . . for--rather, "notwithstanding the . . . notwithstanding"; "in spite of" [LOWTH]. So "for" (Nu 14:11). Babylon was famous for "expiations or sacrifices, and other incantations, whereby they tried to avert evil and obtain good" [DIODORUS SICULUS].

JFB.