Although Prsadhra had committed the sin unknowingly, his family priest, Vasistha, cursed him, saying, "In your next life you shall not be able to become a ksatriya. Instead, you shall take birth as a sudra because of killing the cow"

Expressions researched:
"Although Prsadhra had committed the sin unknowingly, his family priest, Vasistha, cursed him, saying" |"In your next life you shall not be able to become a ksatriya. Instead, you shall take birth as a sudra because of killing the cow"

SB Canto 9

Although Pṛṣadhra had committed the sin unknowingly, his family priest, Vasiṣṭha, cursed him, saying, "In your next life you shall not be able to become a kṣatriya. Instead, you shall take birth as a śūdra because of killing the cow."

SB 9.2.9, Translation and Purport:

Although Pṛṣadhra had committed the sin unknowingly, his family priest, Vasiṣṭha, cursed him, saying, "In your next life you shall not be able to become a kṣatriya. Instead, you shall take birth as a śūdra because of killing the cow."

It appears that Vasiṣṭha was not free from tamo-guṇa, the mode of ignorance. As the family priest or spiritual master of Pṛṣadhra, Vasiṣṭha should have taken Pṛṣadhra's offense very lightly, but instead Vasiṣṭha cursed him to become a śūdra. It is the duty of a family priest not to curse a disciple but to give him relief through the performance of some sort of atonement. Vasiṣṭha, however, did just the opposite. Therefore Śrīla Viśvanātha Cakravartī Ṭhākura says that he was durmati; in other words, his intelligence was not very good.