Matsya Purana 244.13

244.13

daityairnirākṛtān dṛṣṭvā tanayān kurunandana!.
vṛthā putrāhamasmīti nirvedātpraṇatāharim .. 244.11 ..

For one thousand years she worshipped Lord Kṛiṣṇa by living on air alone, and on seeing Her children oppressed by the Devas she said to Herself that Her sons were born in vain and she then saluted Lord Viṣṇu and became very distressed —10-12