Vasiṣṭha–Karāla-Janaka Saṃvāda: Aśuddha-Sevana, Guṇa-Dr̥ṣṭi, and Sāṃkhya–Yoga Ekārthatā
Mahābhārata 12.293
वत्तिश्वैन्नास्ति शूद्रस्थ पितृपैतामही श्लुवा । न वृत्तिं परतो मार्गेच्छुश्रूषां तु प्रयोजयेत्
“If a Śūdra has no definite means of livelihood handed down by his father and forefathers, he should not seek another occupation. He should employ service to the three varṇas as his means of living.”
पराशर उवाच