In addition to these nineteen sons mentioned above, there were eighty-one younger ones, all born of Ṛṣabhadeva and Jayantī. According to the order of their father, they became well-cultured, well-behaved, very pure in their activities and expert in Vedic knowledge and the performance of Vedic rituals. Thus they all became perfectly qualified brāhmaṇas.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यवीयांस एकाशीतिर्जायन्तेयाः पितुरादेशकरा महाशालीना महाश्रोत्रिया यज्ञशीलाः कर्मविशुद्धा ब्राह्मणा बभूवुः
yavīyāṃsa ekāśītirjāyanteyāḥ piturādeśakarā mahāśālīnā mahāśrotriyā yajñaśīlāḥ karmaviśuddhā brāhmaṇā babhūvuḥ
SB 5.4.13