Canto 3 -
Araṇya-kāṇḍa
Chapter 45: Sītā Chastises Lakṣmaṇa

Sītā-devī heard Mārīca’s loud cry, “Ah, Sītā! Lakṣmaṇa!” Since his voice resembled the voice of Śrī Rāmacandra, she feared that He might be in danger and so instructed Lakṣmaṇa to rush to protect Him. Lakṣmaṇa described Rāmacandra’s glory to Sītā-devī and thus established that there is no question of any danger to Him. When she spoke inappropriate and harsh words that were unfit to be heard, Lakṣmaṇa rushed along the path that Rāma had taken.