Rashi on Numbers 23:25/רש"י על במדבר כ״ג:כ״ה

1גם 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).