If those that are to be employed in a Shraddha happen to be dumb, blind or deaf, care should be taken to employ them with the Brahmanas who are learned in the Vedas.
ये ये श्राद्धे न युज्यन्ते मूकान्धबधिरादयः। तेऽपि सर्वे नियोक्तव्या मिश्रिता वेदपारगैः॥