Bhagavatapurana 6.13.9

6.13.9

tamaśvamedhena mahāmakhena śraddhānvito 'smābhiranuṣṭhitena /
hatvāpi sabrahmacarācaraṃ tvaṃ na lipyase kiṃ khalanigraheṇa //

9. By the performance of the great sacrifice, Aswamedha, with faith and with our help and thereby propitiating Him, thou art sure to be untouched by sin even if thou killest, (a Brahman), the whole world of mobile and immobile creatures: then what need be said that thou will not be touched by sin in putting down a wicked creature?''