וַיֹּ֤אמֶר בָּלָק֙ אֶל־בִּלְעָ֔ם גַּם־קֹ֖ב לֹ֣א תִקֳּבֶ֑נּוּ גַּם־בָּרֵ֖ךְ לֹ֥א תְבָרֲכֶֽנּוּ׃
И сказал Валак Валааму: 'Ни прокляни их вообще, ни благослови их вообще.'
Rashi
גם קב לא תקבנו NEITHER (גם) CURSE THEM AT ALL [NOR (גם) BLESS THEM AT ALL] — The first גם adds something to the second גם and the second גם something to the first גם, similar to (1 King 3:26): “Neither mine (גם לי) nor thine (גם לך) shall it be”; and similarly (Deuteronomy 32:25): “also youths (גם בכור) also maidens (גם בתולה)” (i.e. both youths and maidens).
Or HaChaim
גם קב לא חקבנו, "neither curse them, etc." Both the word גם, "also," and the repetition of the verb קב present a difficulty in this verse. Inasmuch as Bileam had told Balak to get up and listen carefully (23,18), Balak interpreted this as a hint that Bileam actually wanted to curse the Israelites but that G'd had thwarted him, as we explained. In view of what had just occurred he said גם to express his dismay that not only had Bileam not cursed the people but had even blessed them. He referred to two possibilities of cursing when he repeated the word. Alas, Bileam had not only not named Israel as the object of a curse but had not even uttered a curse without specifically naming the victim. We may infer from Balak's words that Bileam had been looking for a way of uttering a curse without at the same time incurring punishment at the hands of G'd. He wanted to utter a curse indiscriminately, naming the victim only in his heart. This is the reason that G'd had to prevent him from even uttering a curse without naming anybody.
Chizkuni
גם ברך לא תברכנו, “at least do not bless it!” Bileam was concerned that Bileam’s blessings for the Jewish people were referring to the immediate future. He had no idea that Bileam spoke of what would occur in the distant future.