Say why the giant stole my dame: What have I done that he could blame? What fault in me has Rávaṇ seen That he should rob me of my queen? How looked the lady’s moon-bright cheek? What were the words she found to speak?

In plain words: Rama asks why Ravana stole his wife and what wrong Rama did to deserve it. He also asks how Sita looked and what she said.