Musar על מלכים ב 7:19

And Sefer Charedim 51 states, in the name of the Midrash that the intent of the captain who was punished because he had said (II Kings 7:19): "Even [if] the L-rd made windows in the heavens, could such a thing happen?" — his intent was that the L-rd could certainly make it happen, but this generation was like the generation of the flood, deserving that the windows of heaven be opened [for evil], as there, viz. (Bereshith 7:11): "And the windows of heaven were opened." How is it possible that for such an evil generation as this such a great miracle [for good] could happen? And Elisha the prophet answered him that because he slandered Israel, he would see the miracle, but not eat (viz. II Kings, Ibid.)