Why did he say "hami'Biladei Hashem"?
Rashi: Did I come without permission?! Yeshayah already prophesized in the days of your father Achaz "Yavi Hashem Alecha
In Yeshayah, Rashi brought a less explicit source (refer to 18:25:1:2). There, Rashi holds that 7:17 is not a source, for shortly after (7:20) it clarifies that Melech Ashur will come, but he will be destroyed. Perhaps here, Rashi explained 7:20 like Malbim (that Melech Ashur in the days of Achaz will fall), or he held that Ravshake did not hear the latter verse (it is in a different Parshah). (PF) Also refer to 18:25:1:5, 18:25:1:5 2
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I.e. but if not, he would not know the prophecy. (PF)
Sanhedrin 94b cites the previous verse "Ki Ma'as ha'Am ha'Zeh Es Mei ha'Shilu'ach
Hashem did not say "v'Hishchisah"!
Rashi: He 1 added this on his own.
Some explain that he did not base himself on an explicit prophecy. He extrapolated, or decided that he will fight Hashem's battle, or said so to scare them (refer to 18:25:1:2-4,6).
Ravshake spoke in the name of Sancheriv. It is not clear if Sancheriv added this, or Ravshake. (PF)
