Vibhaṅgasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 935

[935] Bhikkhus, and what is the faculty of grief (domanassindriyaṃ)? Whatever mental pain (cetasikaṃ dukkhaṃ), mental discomfort — painful, disagreeable feeling born of mind-contact (manosamphassajaṃ) — this, bhikkhus, is called the faculty of grief.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.