Devibhagavatapurana 3.29.19

3.29.19

tatraiva vārṣikānmāsāṃstasthau lakṣmaṇasaṃyutaḥ |
cintayañjānakīṃ citte daśānanahṛtāṃ priyām ||

Then, he began to ceaselessly think of the stealing away of Sîtâ by Râvana and passed away the four months of the rainy season there with his brother Laksmana.