When toil my aged strength subdued, His sword my weary pinions hewed. Then lifting up the dame he bare His captive through the fields of air. Thy vengeful blows from me restrain, Already by the giant slain.”

In plain words: Jatayu explains that he grew tired because he was old, and Ravana cut off his wings with a sword and flew away with Sita through the sky. He asks Rama not to attack him, since he is already dying from Ravana's blow.