http://www.sacred-texts.com/hin/sbe48/sbe48137.htm
On the other hand, what is interesting is that for Śrīvaiṣṇavas like Rāmānuja, the Śūdra saint Nammāḷvār was/is the foremost saint.
If you search Indology archives on 'molten', you will find a thread on the issue. Here is a post by Madhav Deshpande. http://list.indology.info/pipermail/indology_list.indology.info/2000-January/020112.html
A discussion on the issue of Śūdra's eligibility to study the Vedas is also found in another thread. Follow the thread from http://list.indology.info/pipermail/indology_list.indology.info/1998-March/011448.html
Regards,
Palaniappan
-----Original Message-----
From: Artur Karp <karp@uw.edu.pl>
To: patrick mccartney <psdmccartney@gmail.com>
Cc: indology <indology@list.indology.info>
Sent: Thu, Nov 21, 2013 7:05 am
Subject: Re: [INDOLOGY] molten lead in ears
Kane, HISTORY OF THE DHARMA ŚĀSTRA, VOL. II PART I, p. 82, Bhandarkar Oriental Research Institute, Poona 1941
has this:
<<...the practice current in the times of the Vedānta-sūtras that the Śūdra is not entitled to study the Veda.
Gaut. XII.4 went so far as to prescribe:—
‘if the śūdra intentionally listens for committing to memory the Veda, then his ears should be filled with (molten) lead and lac; if he utters the Veda, then his tongue may be cut off; if he has mastered the Veda his body should be hacked'.>>
Hoping it's of some help,
Regards,
Artur Karp