Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 37
Sanskrit:
तस्य यक्षपतिर्देव: कुबेरस्त्विडविडासुत: ।रावण: कुम्भकर्णश्च तथान्यस्यां विभीषण: ॥ ३७ ॥
ITRANS:
tasya yakṣa-patir devaḥkuberas tv iḍaviḍā-sutaḥrāvaṇaḥ kumbhakarṇaś catathānyasyāṁ vibhīṣaṇaḥ
Translation:
Viśravā had two wives. The first wife was Iḍaviḍā, from whom Kuvera, the master of all Yakṣas, was born, and the next wife was named Keśinī, from whom three sons were born — Rāvaṇa, Kumbhakarṇa and Vibhīṣaṇa.