Valmiki Ramayana Aranya Kanda Sarga 14 Shloka 12

ततः then, प्रीतः a pleased man, काश्यपः Kasyapa, ताः कन्याः to those young wives, पुनः again, अब्रवीत् said, मत्समान् equal to me, त्रैलोक्यभर्तृ़न् rulers of the three worlds, पुत्रां sons, जनयिष्यथ may give birth to.

Kasyapa, pleased with them said to his young wives, Beget sons of my stature who can rule over the three worlds.