The Great Epic of the Bhārata dynasty 13.84.6

13.84.6

sa hi naiva sma devānāṃ nāsurāṇāṃ na rakṣasām |
vadhyaḥ syāmiti jagrāha varaṃ tvattaḥ pitāmaha || 6 ||

"The Deities said, 'In consequence of thy having granted him boons, that son of Diti has been proud of his might. He is incapable of being slain, by the deities. How then will his death be brought about? The boon which, O Grandsire, he has obtained from thee is that he should not be slayable by deities or Asuras or Rakshasas. The deities have also been cursed by the spouse of Rudra in consequence of their endeavour in former days to stop propagation. The curse denounced by her has been, O lord of the universe, even this, viz., that they are not to have any offspring.'