Valmiki Ramayana Aranya Kanda Sarga 49 Shloka 22
Original Shlokaतामकामां स कामार्तः पन्नगेन्द्रवधूमिव।।3.49.22।। विवेष्टमानामादाय उत्पपाताथ रावणः।
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अथ then, कामार्तः passionate, सः that, रावणः Ravana, अकामाम् not willing, पन्नगेन्द्रवधूमिव like a serpent queen, विवेष्टमानाम् writhing hard, ताम् her, आदाय seized,उत्पपात flew up.
Passionate Ravana took hold of Sita who was not willing and was writhing in pain. He seized her like (an eagle carrying away) a serpent queen and flew up.