The Tipiṭaka in Three Languages

Tatiyavibhaṅgasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 944

[944] And what, bhikkhus, is the faculty of grief (domanassindriya)? Whatever mental pain, whatever mental discomfort there is, the painful, uncomfortable feeling (vedanā) born of mind-contact — this, bhikkhus, is called the faculty of grief.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 3 other places