Srimad Bhagavatam Canto 04, Chapter 02, Text 30

SB 4.2.30

brahma ca brahmanams caiva
yad yuyam parinindatha
setum vidharanam pumsam
atah pasandam asritah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Bhrgu Muni continued: Since you blaspheme the Vedas and the brahmanas, who are followers of the Vedic principles, it is understood that you have already taken shelter of the doctrine of atheism.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Bhrgu Muni, in cursing Nandisvara, said that not only would they be degraded as atheists because of this curse, but they had already fallen to the standard of atheism because they had blasphemed the Vedas, which are the source of human civilization. Human civilization is based on the qualitative divisions of social order, namely the intelligent class, the martial class, the productive class and the laborer class. The Vedas provide the right direction for advancing in spiritual cultivation and economic development and regulating the principle of sense gratification, so that ultimately one may be liberated from material contamination to his real state of spiritual identification (aham brahmasmi). As long as one is in the contamination of material existence, one changes bodies from the aquatics up to the position of Brahma, but the human form of life is the highest perfectional life in the material world. The Vedas give directions by which to elevate oneself in the next life. The Vedas are the mother for such instructions, and the brahmanas, or persons who are in knowledge of the Vedas, are the father. Thus if one blasphemes the Vedas and brahmanas, naturally one goes down to the status of atheism. The exact word used in Sanskrit is nastika, which refers to one who does not believe in the Vedas but manufactures some concocted system of religion. Sri Caitanya Mahaprabhu has said that the followers of the Buddhist system of religion are nastikas. In order to establish his doctrine of nonviolence, Lord Buddha flatly refused to believe in the Vedas, and thus, later on, Sankaracarya stopped this system of religion in India and forced it to go outside India. Here it is stated, brahma ca brahmanan. Brahma means the Vedas. Aham brahmasmi means “I am in full knowledge.” The Vedic assertion is that one should think that he is Brahman, for actually he is Brahman. If brahma, or the Vedic spiritual science, is condemned, and the masters of the spiritual science, the brahmanas, are condemned, then where does human civilization stand? Bhrgu Muni said, “It is not due to my cursing that you shall become atheists; you are already situated in the principle of atheism. Therefore you are condemned.”
Srimad Bhagavatam Canto 04, Chapter 02, Text 29
Srimad Bhagavatam Canto 04, Chapter 02, Text 31