Canto 3 -
Araṇya-kāṇḍa
Chapter 63: Rāma’s Pain of Separation from Sītā

When Lord Rāma did not see Sītā-devī, He addressed Lakṣmaṇa and contemplated the possibility of her being subjected to various difficulties and lamented about her. Lakṣmaṇa then consoled His brother Rāmacandra who wailed in various ways like a mad man.