Garudapurana 3.15.13

3.15.13

sa eva dataḥ samabhūdrameśonasūyāyāmatrirūpaḥ parātmā /
ānvīkṣikiṃ nāma sutarkavidyāmalarkanāmne pradadāttāṃ mahātmā //

That very lord of Ramā became Datta upon Anasūyā, the supreme Self in the form of Atri's [son]; / that great-souled one bestowed the science of good dialectics, named rational inquiry, upon the one named Alarka.