भृगुवंश-प्रसववर्णनम्
Genealogical Emanations in the Bhṛgu Line
पर्वशस्य स्नुवे ते वै पूर्णमास सुतस्य तु / ऊर्जायां तु वसिष्ठस्य वासिष्ठाः सप्त जज्ञिरे
parvaśasya snuve te vai pūrṇamāsa sutasya tu / ūrjāyāṃ tu vasiṣṭhasya vāsiṣṭhāḥ sapta jajñire
They were the daughters-in-law of Parvaśa, and are also spoken of as sons of Pūrṇamāsa; from Ūrjā, Vasiṣṭha begot seven renowned Vāsiṣṭhas.