Mimamsasutra 110.2

110.2

mahatā prayatnena śabdam uccaranti - vāyur nābher utthitaḥ, urasi vistīrṇaḥ, kaṇṭhe vivartitaḥ, mūrdhānam āhatya parāvṛttaḥ, vaktre vicaran vividhān śabdān abhivyanakti. tatrāparādhyetāpy uccārayitā, yathā - śuṣke patiṣyāmīti kardame patati, sakṛd upasprakṣyāmīti dvir upaspṛśati. tato 'parādhāt pravṛttā gāvyādayo bhaveyuḥ, na niyogato 'vicchinnapāramparyā eveti.

They utter a word with great effort: air, rising from the navel, expanded in the chest, modified in the throat, striking the head and turning back, circulating in the mouth, manifests various sounds. In that process, the speaker may well err, just as [thinking] 'I shall fall on dry ground,' one falls into the mud, or [thinking] 'I shall touch [water] once,' one touches it twice. Words like *gāvī* and the rest might have arisen from that error; they do not necessarily have an unbroken tradition at all.