Srimad Bhagavatam

References to text SB 7.11.35
SB 7.11.35: If one shows the symptoms of being a brÄhmaṇa, ká¹£atriya, vaiÅ›ya or śūdra, as described above, even if he has appeared in a different class, he should be accepted according to those symptoms of classification.

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A civilized human being has three kinds of births. The first birth is by a pure father and mother, and this birth is called birth by semen. The next birth takes place when one is initiated by the spiritual master, and this birth is called sÄvitra. The third birth, called yÄjñika, takes place when one is given the opportunity to worship Lord Viṣṇu. Despite the opportunities for attaining such births, even if one gets the life span of a demigod, if one does not actually engage in the service of the Lord, everything is useless. Similarly, one’s activities may be mundane or spiritual, but they are useless if they are not meant for satisfying the Lord.
Narada Instructs the Pracetas
SB 4.31.10
From the son of Manu named Dhṛṣṭa came a ká¹£atriya caste called DhÄrṣṭa, whose members achieved the position of brÄhmaṇas in this world. Then, from the son of Manu named Ná¹›ga came Sumati. From Sumati came BhÅ«tajyoti, and from BhÅ«tajyoti came Vasu.
The Dynasties of the Sons of Manu
SB 9.2.17
Diṣṭa had a son by the name NÄbhÄga. This NÄbhÄga, who was different from the NÄbhÄga described later, became a vaiÅ›ya by occupational duty. The son of NÄbhÄga was known as Bhalandana, the son of Bhalandana was VatsaprÄ«ti, and his son was PrÄá¹Å›u. PrÄá¹Å›u’s son was Pramati, Pramati’s son was Khanitra, Khanitra’s son was CÄká¹£uá¹£a, and his son was Viviá¹Å›ati.
The Dynasties of the Sons of Manu
SB 9.2.23-24
Here is a learned, highly qualified brÄhmaṇa, engaged in performing austerity and eagerly desiring to worship the Supreme Lord, the Supersoul who lives within the core of the heart in all living entities.
The Dynasty of Amsuman
SB 9.9.29
ViÅ›vÄmitra, the son of MahÄrÄja GÄdhi, was as powerful as the flames of fire. From the position of a ká¹£atriya, he achieved the position of a powerful brÄhmaṇa by undergoing penances and austerities.
Lord Parasurama Destroys the World's Ruling Class
SB 9.16.28
When brÄhmaṇas are free from envy, untruthfulness, unnecessary pride, grudges, disturbance by the opulence of others, and false prestige, their blessings never go in vain. Considering this, Nanda MahÄrÄja soberly took Kṛṣṇa on his lap and invited such truthful brÄhmaṇas to perform a ritualistic ceremony according to the holy hymns of the SÄma Veda, Ṛg Veda and Yajur Veda. Then, while the hymns were being chanted, he bathed the child with water mixed with pure herbs, and after performing a fire ceremony, he sumptuously fed all the brÄhmaṇas with first-class grains and other food.
The Killing of the Demon Trinavarta
SB 10.7.13-15