Vedanāsutta
Sāvatthinidānaṁ. “Tisso imā, bhikkhave, vedanā. Katamā tisso? Sukhā vedanā, dukkhā vedanā, adukkhamasukhā vedanā— imā kho, bhikkhave, tisso vedanā. Imāsaṁ kho, bhikkhave, tissannaṁ vedanānaṁ pariññāya ariyo aṭṭhaṅgiko maggo bhāvetabbo. Katamo ariyo aṭṭhaṅgiko maggo? Seyyathidaṁ—sammādiṭṭhi …pe… sammāsamādhi. Imāsaṁ kho, bhikkhave, tissannaṁ vedanānaṁ pariññāya ariyo aṭṭhaṅgiko maggo bhāvetabbo”ti.
Feeling
At Sāvatthī. “Mendicants, there are these three feelings. What three? Pleasant, painful, and neutral feeling. These are the three feelings. The noble eightfold path should be developed to completely understand these three feelings. What is the noble eightfold path? It is right view, right purpose, right speech, right action, right livelihood, right effort, right mindfulness, and right immersion. This noble eightfold path should be developed to completely understand these three feelings.”