Markandeyapurana 5.9

5.9

sakhyañcakrustatastasya vṛtreṇa samayāṃstathā /
ṛṣayaḥ prītamanasaḥ sarvabhūtahite ratāḥ //

“Then uprose Vṛtra, the mighty Asura, encircled with flame, huge in body, with great teeth, resembling a mass of broken collyrium. He, the enemy of Indra, of immeasurable soul, surpassing the might of Tvaṣṭṛ, mighty in valour, increased daily a bow-shot in stature. And Indra, having seen the mighty Asura Vṛtra eager for his slaughter, unnerved by fear, sent seven Ṛṣis, desiring peace. Then the affectionate-minded Ṛṣis, who delighted in benevolence towards all creatures, brought about friendship and treaties between him and Vṛtra. When Indra violating the rules of the treaty slew Vṛtra, then his might overwhelmed by the sin of the slaughter waned; and that might which quitted Indra’s body entered the wind, which pervades everything, is imperceptible, and is the supreme deity of power.