Simply taking birth in the family of a brahmana does not make one qualified to perform yajnas. One must be twice-born by proper training and initiation from the bona fide acarya

Expressions researched:
"Simply taking birth in the family of a brahmana does not make one qualified to perform yajnas. One must be twice-born by proper training and initiation from the bona fide acarya"

Srimad-Bhagavatam

SB Canto 1

Simply taking birth in the family of a brahmana does not make one qualified to perform yajnas. One must be twice-born by proper training and initiation from the bona fide acarya.

SB 1.12.35, Translation and Purport

Lord Śrī Kṛṣṇa, the Personality of Godhead, being invited to the sacrifices by Mahārāja Yudhiṣṭhira, saw to it that they were performed by qualified [twice-born] brāhmaṇas. After that, for the pleasure of the relatives, the Lord remained a few months.

Lord Śrī Kṛṣṇa was invited by Mahārāja Yudhiṣṭhira to look into the supervision of the performances of yajña, and the Lord, to abide by the orders of His elderly cousin, caused the performance of yajñas by learned twice-born brāhmaṇas. Simply taking birth in the family of a brāhmaṇa does not make one qualified to perform yajñas. One must be twice-born by proper training and initiation from the bona fide ācārya. The once-born scions of brāhmaṇa families are equal with the once-born śūdras, and such brahma-bandhus, or unqualified once-born scions, must be rejected for any purpose of religious or Vedic function. Lord Śrī Kṛṣṇa was entrusted to look after this arrangement, and perfect as He is, He caused the yajñas to be performed by the bona fide twice-born brāhmaṇas for successful execution.