Could you please tell if the quote often associated with the prophet that if Prostrating infront of anyone else other than god was permissible than i would have asked wives to prostrate infront of their husband is authentic? Is it anywhere in out shia authentic traditions?

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Yes this hadith is authentic and in our sources such as al-Kafi. However, this hadith is not to be taken literally. It’s symbolic. It means that a wife should be lenient, flexible and obedient to her husband to have a good marital life. Of course the husband has to be caring and respectful. If a wife becomes arrogant, she wants to boss around the husband, etc…usually such marriages fail.