SB 6.18.69
athendram aha tataham
adityanam bhayavaham
apatyam icchanty acaram
vratam etat suduskaram
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Thereafter, Diti said to Indra: My dear son, I adhered to this difficult vow just to get a son to kill you twelve Adityas.