Śrīmad-Bhāgavatam · Text 11.17.47
Who is speaking and story frame
सीदन् विप्रो वणिग्वृत्त्या पण्यैरेवापदं तरेत् ।
खड्गेन वापदाक्रान्तो न श्ववृत्त्या कथञ्चन ॥ ४७ ॥
sīdan vipro vaṇig-vṛttyā
paṇyair evāpadaṁ taret
khaḍgena vāpadākrānto
na śva-vṛttyā kathañcana
If a brāhmaṇa cannot support himself through his regular duties and is thus suffering, he may adopt the occupation of a merchant and overcome his destitute condition by buying and selling material things. If he continues to suffer extreme poverty even as a merchant, then he may adopt the occupation of a kṣatriya, taking sword in hand. But he cannot in any circumstances become like a dog, accepting an ordinary master.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.