Why God Forbade Balaam to Curse or Even Bless Israel

Midrash Aggadah, Numbers 22:12

"You shall not go with them" (Numbers 22:12) — because the Holy One, blessed be He, does not desire the destruction of the wicked. Balaam said: You stipulate to me that I shall not go with them; I will curse them from my own place. The Holy One, blessed be He, said to him: "You shall not curse the people." Balaam said: And do You wish that I bless them? The Holy One, blessed be He, said to him: They do not need your blessing, for they are blessed.

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