From the son of Manu named Dhṛṣṭa came a kṣatriya caste called Dhārṣṭa, whose members achieved the position of brāhmaṇas in this world. Then, from the son of Manu named Nṛga came Sumati. From Sumati came Bhūtajyoti, and from Bhūtajyoti came Vasu.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
धृष्टाद्धार्ष्टमभूत्क्षत्रं ब्रह्मभूयं गतं क्षितौ । नृगस्य वंशः सुमतिर्भूतज्योतिस्ततो वसुः
dhṛṣṭāddhārṣṭamabhūtkṣatraṃ brahmabhūyaṃ gataṃ kṣitau | nṛgasya vaṃśaḥ sumatirbhūtajyotistato vasuḥ
SB 9.2.17