Atharvavedaparishishta 3.2.4

3.2.4

hīnādhikāṅgaṃ patitaṃ vivarṇaṃ stenaṃ jaḍaṃ klībam aśaktiyuktam | bhinnasvaraṃ kāṇaṃ virūpanetraṃ dveṣyaṃ ca rājā guruṃ naiva kuryāt ||

A king should never appoint as guru one with deficient or redundant limbs, a fallen man, one of bad complexion, a thief, an idiot, a eunuch, an impotent man, / one with a broken voice, one-eyed, with deformed eyes, or one who is repulsive.