Kabbalah su Salmi 32:7

There is a great mystery here, which is why 'Esther' is derived from mystery (Heb. seter), as written, "You are my hiding place (Heb. seter)" (Psalms 32:7), since the Shechinah hid her from Ahasuerus and gave him a female demon instead while she returned to Mordechai's arm(s). And Mordechai, who knew the explicit Name and the seventy tongues, did all this with wisdom. This is why the sages of the Mishnah stated that even regardless of this, a man must speak with his wife before he mates with her, because she might have been exchanged with a female demon.