Revākhaṇḍa ascribed to the Vāyupurāṇa (RKV) 38.64

38.64

pṛthivyāṃ yāni tīrthāni gaṅgādyāḥ saritas tathā /
ekasya vipravākyasya kalāṃ nārhanti ṣoḍaśīm //

Whatever pilgrimage places are on earth, as well as the Gaṅgā and other rivers, / are not worth a sixteenth part of a single brahmin's word.”