Valmiki Ramayana Aranya Kanda Sarga 54 Shloka 30

ततः then, राक्षसः the demons, सः रावणः that Ravana, सीताम् Sita, उपलभ्य seeing, मैथिलीम् Maithili, परिगृह्य getting, सुसम्प्रहृष्टः feeling extremely happy, रामेण at Rama, उत्तमम् highest, वैरम् enmity, प्रसज्य incited, मोहात् in delusion, मुदितः rejoiced, बभूव became.

Then the demon Ravana felt greatly happy for getting Sita, princess of Mithila, without knowing in his delusion that he had created the bitterest enmity with Rama. इत्यार्षे श्रीमद्रामायणे वामलीकीये आदिकाव्ये अरण्यकाण्डे चतुःपञ्चाशस्सर्गः।। Thus ends the fiftyfourth sarga of Aranyakanda of the holy Ramayana the first epic composed by sage Valmiki.