|Canto 9: Liberation||Chapter 6: The Downfall of Saubhari Muni|
Bhaktivedanta VedaBase: Śrīmad Bhāgavatam 9.6.3
ete kṣetra-prasūtā vai
punas tv āńgirasāḥ smṛtāḥ
ete — the sons begotten by Ańgirā; kṣetra-prasūtāḥ — became the children of Rathītara and belonged to his family (because they were born from the womb of his wife); vai — indeed; punaḥ — again; tu — but; āńgirasāḥ — of the dynasty of Ańgirā; smṛtāḥ — they were called; rathītarāṇām — of all the sons of Rathītara; pravarāḥ — the chief; kṣetra-upetāḥ — because of being born of the kṣetra (field); dvi-jātayaḥ — called brāhmaṇa (being a mixture of brāhmaṇa and kṣatriya).
Having been born from the womb of Rathītara's wife, all these sons were known as the dynasty of Rathītara, but because they were born from the semen of Ańgirā, they were also known as the dynasty of Ańgirā. Among all the progeny of Rathītara, these sons were the most prominent because, owing to their birth, they were considered brāhmaṇas.
Śrīla Viśvanātha Cakravartī Ṭhākura gives the meaning of dvi jātayaḥ as "mixed caste," indicating a mixture of brāhmaṇa and kṣatriya.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness