Skandapurana 6.3.172.89

6.3.172.89

agamyāgamane pāpamayājyayājane kṛte .
steyācca brahmagohatyāgurughātācca pātakam .
tatsarvaṃ naśyate pāpaṃ vṛṣotsarge kṛte tu vai .. 172.89 ..

Whatever sin is incurred by approaching forbidden women, by sacrificing for those unfit to sacrifice, / or crime born of theft, slaying a brahmin, killing a cow, or murdering a guru— / all that sin is destroyed when a bull is released. 172.89