Matsyapurana 146.28

146.28

vartantyā niyame tasyāḥ sahasrākṣaḥ samāhitaḥ
upāsāmācarattasyāḥ sā cainamanvamanyata //

Indra began to serve Diti vigilantly on her observing such severe austerities. When only 10 years remained to complete the (1,000 years) period of her austerities Diti was pleased and said to Indra — "Son! I have well nigh completed the term of my vow, you will have a brother in conjunction with whom you may enjoy the riches of the universe undisturbed and reign over the three worlds" Saying this, Ditı went to sleep and her long tresses of hair fell on her legs As ill luck would have it, Ditı went over to sleep and Indra taking advantage of that loop hole, entered into her embryo He divided the womb into seven parts by his bolt Afterwards out of rage he divided each part into seven Diti awoke and said angrily —"Indra! do not destroy my progeny"—28 34