Wyjścia 11:9 Komentarz: Rashi, Chizkuni, Ramban & Sforno

למען רבות מופתי SO THAT MY WONDERS MAY BE MULTIPLIED (more lit., so that my wonders may be many) — referring not to one wonder alone (the slaying of the firstborn) but to the slaying of the firstborn, the division of the Red Sea and the overthrowing of the Egyptians in it.

לא ישמע אליכם פרעה, “Pharaoh will pay no heed to you.” You might argue that this contradicts what we read in verses 30-31, where Pharaoh and his servants are described as rising in the middle of the night, showing that he certainly did not ignore Moses’ warning. We therefore have to understand our verse here as referring to the entire period during which Moses was “negotiating” the release of the Jewish people. G-d had told Moses already at the burning bush that Pharaoh would not pay heed to his demands or threats. (Exodus 3,19) He had told him at that time that the reason for the lengthy negotiations was to demonstrate to him and his people G-d’s power by orchestrating the plagues.

AND THE ETERNAL SAID UNTO MOSES: PHARAOH WILL NOT HEARKEN UNTO YOU. It was to be expected that Pharaoh and his servants should dread the plague of the firstborn and be in consternation thereof moreso than for anything that had happened to them — indeed they had previously seen all the words of Moses fulfilled. G-d therefore informed Moses that it is He Who is hardening his [Pharaoh’s] heart, so that His wonders would be multiplied through the plague of the firstborn in both man and beast and the judgments He will execute against their gods.⁹⁴Further, 12:12.
Rashi commented: “So that My wonders may be multiplied. This refers to the slaying of the firstborn, the division of the Red Sea, and the overthrowing of the Egyptians in it.” This explanation is not possible, because of the verse after that which states, And the Eternal hardened Pharaoh’s heart, and he did not let the children of Israel go out of his land.⁹⁶Verse 10. This indicates that the expression, that My wonders may be multiplied, which was mentioned in Verse 9, refers only to those wonders which took place before the exodus, as Verse 10 clearly indicates that on account of the hardening of Pharaoh’s heart he did not let the people go. It thus cannot refer to the division of the Red Sea and the overthrowing of the Egyptians in it, as these wonders happened after the exodus (Mizrachi).