Shiva Purana

siva.sh/siva-purana/uma-samhita/6/38

अजाविको माहिषिकस्सामुद्रो वृषलीपतिः ।। शूद्रवत्क्षत्रवृत्तिश्च नारकी स्याद् द्विजाधमः ।। ३८ ।।

sanskrit

The base brahmin who rears goats, sheep and buffaloes and who marries a Śūdra woman and who lives on fishing etc. is a Śudra. If he follows the occupation of a Kṣattriya he is sure to go to hell.

english translation

ajAviko mAhiSikassAmudro vRSalIpatiH || zUdravatkSatravRttizca nArakI syAd dvijAdhamaH || 38 ||

hk transliteration by Sanscript