Valmiki Ramayana Yuddha Kanda Sarga 129 Shloka 30
Original Shlokaतांसुवर्णपरिष्कारेशुभेमहतिवेश्मनि ।।6.129.30।। प्रवेश्यमैथिलींवाक्यैस्सान्त्वयामासरावणः ।
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सःरावणः that Ravana, तांमैथिलीम् that Mythili, सुवर्णपरिष्कारे mansion with golden walls, शुभे auspicious, महति huge, वेश्मनि mansion, मैथिलीम् Mythili, प्रवेश्य entered, वाक्यैः good words, सान्त्वयामास consoled
"Ravana kept Mythili in an auspicious huge mansion with golden walls and consoled her with good words."