Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 38

Sanskrit:

निशम्य तद्वचो विप्रो विमना: पर्यतप्यत ।अहो अधर्म: सुमहानद्य मे समुपस्थित: ॥ ३८ ॥

ITRANS:

niśamya tad-vaco viprovimanāḥ paryatapyataaho adharmaḥ sumahānadya me samupasthitaḥ

Translation:

Upon hearing Diti’s request, Kaśyapa Muni was very much aggrieved. “Alas,” he lamented, “now I face the danger of the impious act of killing Indra.”

Purport:

Although Kaśyapa Muni was eager to fulfill the desire of his wife Diti, when he heard that she wanted a son to kill Indra his jubilation was immediately reduced to nothing because he was averse to the idea.