Srimad Bhagavatam Canto 06, Chapter 18, Text 56

SB 6.18.56

matr-svasur abhiprayam
 indra ajñaya manada
susrusanenasrama-stham
 ditim paryacarat kavih
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
O King, who are respectful to everyone, Indra understood Diti’s purpose, and thus he contrived to fulfill his own interests. Following the logic that self-preservation is the first law of nature, he wanted to break Diti’s promise. Thus he engaged himself in the service of Diti, his aunt, who was residing in an asrama.
Srimad Bhagavatam Canto 06, Chapter 18, Text 55
Srimad Bhagavatam Canto 06, Chapter 18, Text 57