Can you tell me authenticity of these things ?
PUNISHMENT FOR LOW CASTE HINDUS
Apastambha Dharma Sutra III, 10-26, says:
The tongue of a Shudra, who spoke evil about a BRAHMIN should be cut off A Shudra who dared to assume a position of equality with the first three castes was to be flogged. If a Shudra overheard a recitation of the Vedas, molten tin was to be poured into his ears; if he repeated the Vedas his tongue should be cut and if he remembered Vedic hymns, his body was to be torn into pieces.
MANU, 167-272 says:
If a Shudra arrogantly teaches Brahmins Dharma, the king shall cause hot oil to be poured into his mouth and ears.
Here is the aphorism of the Brahma-Sutras:
Shravana, adhyana, arthapratishedhat smriteh ca (Brahma-Sutras 1.3.9.38)
Meaning:
The smrithi orders that shudras must be prohibited from hearing, studying and understanding the Vedas.