Mimamsashastrasarvasva 3.6

3.6

nyāyena tena śākyādigranthasyāpi bhaviṣyati⁴ ”
śuddhavākyasamākhyāpi pravaktṛtve nibandhanā

by that same reasoning it will hold for the text of the Śākyas and others as well.” (4)
Even the mere designation of a pure text is based on an expounder.