Devibhagavatapurana 3.9.46

3.9.46

kathyamānaṃ mayā rājañchrutaṃ sarvaṃ savistaram |
anakṣaro mahāmūrkho nāmnā satyavrato dvijaḥ ||

O king! There was a Brahmân, named Satyavrata, quite illiterate, a thorough block-head. Once he heard the letter “Ai, Ai” being uttered by a pig; and in course of a talk he himself uttered incidentally that letter and thereby became the one of the best Pundits.
N. B. – “Aim” is the seed mantra of Sarasvatî, the Goddess of learning.