From the son of Manu named Dhrsta came a ksatriya caste called Dharsta, whose members achieved the position of brahmanas in this world. Then, from the son of Manu named Nrga came Sumati. From Sumati came Bhutajyoti, and from Bhutajyoti came Vasu

Expressions researched:
"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-Bhagavatam

SB Canto 9

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.

SB 9.2.17, Translation and Purport

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.

Here it is said, kṣatraṁ brahma-bhūyaṁ gataṁ kṣitau: although the Dhārṣṭas belonged to the kṣatriya caste, they were able to convert themselves into brāhmaṇas. This gives clear evidence supporting the following statement by Nārada (SB 7.11.35):

yasya yal lakṣaṇaṁ proktaṁ

puṁso varṇābhivyañjakam

yad anyatrāpi dṛśyeta

tat tenaiva vinirdiśet

If the qualities of one group are found in the men of another, those men should be recognized by their qualities, by their symptoms, not by the caste of the family in which they were born. Birth is not at all important; it is one's qualities that are stressed in all Vedic literature.