Are there any proofs from Shastras that a neglectful Bramhana becomes a Sudra in this birth?
The following verse is saying that a degraded Brahmin has to be practically treated as a Sudra.
Manu Smriti 8.102. Brahmanas who tend cattle, who trade, who are mechanics, actors (or singers), menial servants or usurers, the (judge) shall treat like Sudras.
So, the degradation is real and with real consequences.
But if you want see such a degraded Brahmin to be regarded (in the scriptures) as a Sudra in ALL respects then that is not possible because their births are separating the two and if we ignore the birth aspect TOTALLY then we are ignoring all the past birth Karmas that led to it.
I defently think the below verses must literally make a Bramhana a Sudra but I am confused that Manu 11.192 prescribes Initiation for a Bramhana again by doing penance.Kanchi Paramacharya says after 3 Generations if a Family doesn't chant Gayatri, they can never become Bramhanas again. But I don't have any scriptural proofs for this. If anyone can answer these riddles I will be thankful.
- But he who does not perform Sandhya Vandana standing in the morning, nor sitting in the evening, shall be excluded, like a Sudra, from all the duties and rights of an Dvija.(Manu 2.103)
- A Brahmana who without studying the Vedas who labors for other things material wealth, position, adoration, and other opulences, becomes Sudra along with all his family members.(Manu 2.168)
- Having recourse to superior kinds of people, and avoiding the inferior kinds, the Brāhmaṇa attains eminence; by the contrary procedure, he becomes a Śūdra.(Manu 4.245)
- By selling meat, lac and salt, the BRAMHANA BECOMES AN OUTCAST AT ONCE; and by selling milk the BRAMHANA BECOMES A SUDRA IN THREE DAYS(Manu 10.92)
- He who, without having studied the Veda, labours over other studies, BECOMES A SUDRA ALONG WITH HIS OFFSPRING.(Vishnu 28.36)
- That wretched Brahmin, who neglects his duties, and whose behavior becomes corrupt, becomes a Śūdra. The Brahmin, who weds a Śūdra woman, who becomes vile in conduct, or a dancer or a village servant, or does other improper acts, becomes a Śūdra. Whether he recites the Vedas or not, O king, if he does such improper acts, he becomes equal to a Śūdra, and on occasions of feeding, he should be assigned a place amongst Śūdras.” (MB Shanti. 62.4-5)
- Those Brahmanas who are devoid of the knowledge of Vedas and not performing Agnihotra are indeed equal to Shudras. A Dharmic King should not only collect taxes from them, he should make them serve him without paying wages.The following five types of Brahmanas are considered to be outcastes : Those who call out the names of accuser, defendant and witnesses in court, who worship gods in temple by taking salary, who make a living by using astrology, who do the functions of a priest of villages and who travel over ‘seas’(MB Shanti 76,Shl 1–6)