Parihānadhammasutta
“Parihānadhammañca vo, bhikkhave, desessāmi aparihānadhammañca cha ca abhibhāyatanāni. Taṁ suṇātha. Kathañca, bhikkhave, parihānadhammo hoti? Idha, bhikkhave, bhikkhuno cakkhunā rūpaṁ disvā uppajjanti pāpakā akusalā sarasaṅkappā saṁyojaniyā. Tañce bhikkhu adhivāseti nappajahati na vinodeti na byantīkaroti na anabhāvaṁ gameti, veditabbametaṁ, bhikkhave, bhikkhunā: ‘parihāyāmi kusalehi dhammehi’. Parihānañhetaṁ vuttaṁ bhagavatāti …pe….
Liable to Decline
“Mendicants, I will teach you who is liable to decline, who is not liable to decline, and the six fields of mastery. Listen … And how is someone liable to decline? When a mendicant sees a sight with their eyes, bad, unskillful phenomena arise: memories and thoughts that tighten the fetters. Suppose that mendicant tolerates them and doesn’t give them up, dispel them, eliminate them, and obliterate them. They should understand: ‘My skillful qualities are declining. For this is what the Buddha calls decline.’