Mahabharata 12.36.29

तथा वैश्ये च शूद्रे च पादः पादो विधीयतेविद्यादेवंविधेनैषां गुरुलाघवनिश्चयम्

tathā vaiśye ca śūdre ca pādaḥ pādo vidhīyatevidyādevaṃvidhenaiṣāṃ gurulāghavaniścayam

Our plain-language meaning of this verse is waiting for scholar review.