SB 6.18.38
nisamya tad-vaco vipro
vimanah paryatapyata
aho adharmah sumahan
adya me samupasthitah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Upon hearing Diti’s request, Kasyapa Muni was very much aggrieved. “Alas,” he lamented, “now I face the danger of the impious act of killing Indra.”
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Although Kasyapa 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.