Manusmriti

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अजीवंस्तु यथोक्तेन ब्राह्मणः स्वेन कर्मणा । जीवेत् क्षत्रियधर्मेण स ह्यस्य प्रत्यनन्तरः ॥ ८१ ॥

sanskrit

But a Brahmana, unable to subsist by his peculiar occupations just mentioned, may live according to the law applicable to Kshatriyas; for the latter is next to him in rank.

english translation

ajIvaMstu yathoktena brAhmaNaH svena karmaNA | jIvet kSatriyadharmeNa sa hyasya pratyanantaraH || 81 ||

hk transliteration by Sanscript