Devibhagavatapurana 3.18.21

3.18.21

manoramāṃ tathocuste munayaḥ saṃśitavratāḥ |
putraste'dya dharādhīśo bhaviṣyati śucismite ||

The Munis, who have taken vows, addressed Manoramâ also “Your son will soon become the lord of the world; you need not care any more.”