Sundarakānda - Canto 51

Narrating the story of Śrī Rāma from the latterís entry into the forest, to his own sight of Sītā being borne away by Rāvana through the air over the Rsyamūka mountain, and celebrating the glory of Śrī Rāma, Hanumān points out to Rāvana that if he longed to survive he should restore Sītā to Śrī Rāma and that he should be prepared for the worst if, on the other hand, he chooses not to part with her.