Those Brahmanas who pour libations on the sacred fire for Shudras or who are preceptors of Shudras, or who are servant of Shudra masters, should not be invited.
होतारो वृषलानां च वृषलाध्यापकास्तथा। तथा वृषलशिष्याश्च राजन् नार्हन्ति केतनम्॥