Canto 3 -
Araṇya-kāṇḍa
Chapter 56: Sītā is Taken to Aśoka-vana
Rāvaṇa’s allurements had no effect on Sītā-devī’s mind. She placed a blade of grass between him and her, criticized him in many ways and proceeded to describe the power of Lord Rāmacandra. After informing Rāvaṇa that he would be killed by her husband, she became silent. Rāvaṇa told Sītā that if she didn’t accept him within a year, he would kill her. He then ordered his rākṣasīs to take Sītā to Aśoka-vana and bring her under control through threats, allurements and so on. They took Sītā to Aśoka-vana and attentively guarded her.