Mahabharata 12.211.20

जातिनिर्वेदमुक्त्वा हि कर्मनिर्वेदमब्रवीत्कर्मनिर्वेदमुक्त्वा च सर्वनिर्वेदमब्रवीत्

jātinirvedamuktvā hi karmanirvedamabravītkarmanirvedamuktvā ca sarvanirvedamabravīt

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