Instruction should not be given to one who belongs to a low or degraded caste. It is said that the preceptor who delivers instruction to such a person commits great sin.
उपदेशो न कर्तव्यो जातिहीनस्य कस्यचित्। उपदेशे महान् दोष उपाध्यायस्य भाष्यते॥