Mahabharata 5.17.9

य इमे ब्रह्मणा प्रोक्ता मन्त्रा वै प्रोक्षणे गवाम्एते प्रमाणं भवत उताहो नेति वासवनहुषो नेति तानाह तमसा मूढचेतनः

ya ime brahmaṇā proktā mantrā vai prokṣaṇe gavāmete pramāṇaṃ bhavata utāho neti vāsavanahuṣo neti tānāha tamasā mūḍhacetanaḥ

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