One verse

Srimad Bhagavatam 7.1.44

7.1.44

ततस्तौ राक्षसौ जातौ केशिन्यां विश्रव:सुतौ । रावण: कुम्भकर्णश्च सर्वलोकोपतापनौ ॥ ४४ ॥

tatas tau raksasau jatau kesinyam visravah-sutau ravanah kumbhakarnas ca sarva-lokopatapanau

tatah
thereafter
tau
the two doorkeepers (Jaya and Vijaya)
raksasau
demons
jatau
born
kesinyam
in the womb of Kesini
visravah-sutau
the sons of Visrava
ravanah
Ravana
kumbhakarnah
Kumbhakarna
ca
and
sarva-loka
to all people
upatapanau
giving misery.

Thereafter the same Jaya and Vijaya, the two doorkeepers of Lord Visnu, took birth as Ravana and Kumbhakarna, begotten by Visrava in the womb of Kesini. They were extremely troublesome to all the people of the universe.