SB 6.13.7
hayamedhena purusam
paramatmanam isvaram
istva narayanam devam
moksyase ’pi jagad-vadhat
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The rsis continued: O King Indra, by performing an asvamedha sacrifice and thereby pleasing the Supreme Personality of Godhead, who is the Supersoul, Lord Narayana, the supreme controller, one can be relieved even of the sinful reactions for killing the entire world, not to speak of killing a demon like Vrtrasura.