New answers tagged shir-hashirim
Because they're lovers. And lovers can and should do all sorts of ervah-related things in private that don't belong in public. (That verse is actually the Talmud's prooftext.)
Shir hashirim is in the form of God speaking to his lover/wife Israel. Even if voices are ervahs for you and me, the husband is obviously permitted to his wife's voice and see her real hair and other things.
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