Bhagavatapurana 6.12.6

6.12.6

indro na vajraṃ jagṛhe vilajjitaś cyutaṃ svahastādarisannidhau punaḥ /
tamāha vṛtro hara āttavajro jahi svaśatruṃ na viṣādakālaḥ //

6. Out of shame in the presence of his enemy Indra did not take up the Vajra which had slipped from his hand; and to him Vritra said, “O Indra, strike, take up thy Vajra, slay thy enemy; this is not the time for despondency.”