The Great Epic of the Bhārata dynasty 3.263.42

3.263.42

etāvacchakyamasmābhirvaktuṃ draṣṭāsi jānakīm |
dhruvaṃ vānararājasya vidito rāvaṇālayaḥ || 42 ||

Repairing unto him, inform of thy cause of sorrow. In plight very much like thy own, he will render thee assistance. This is all that we can say. Thou wilt, without doubt, see the daughter of Janaka! Without doubt Ravana and others are known to the king of the monkeys!' Having said these words, that celestial being of great effulgence made himself invisible, and those heroes, both Rama and Lakshmana, wondered much."