The Tipiṭaka in Three Languages

Pariññātasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 812

[812] He dwells contemplating the mind in the mind (citta), ardent, clearly comprehending, mindful, having removed covetousness and grief regarding the world. As he dwells contemplating the mind in the mind, the mind becomes fully understood (pariññāta); because the mind has been fully understood, the Deathless (amata) is realized.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places