Vedanāsutta

“Tisso imā, bhikkhave, vedanā. Katamā tisso? Sukhā vedanā, dukkhā vedanā, adukkhamasukhā vedanā— imā kho, bhikkhave, tisso vedanā. Imāsaṁ kho, bhikkhave, tissannaṁ vedanānaṁ abhiññāya pariññāya parikkhayāya pahānāya …pe… ayaṁ ariyo aṭṭhaṅgiko maggo bhāvetabbo”ti. Navamaṁ.

“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 for the direct knowledge, complete understanding, finishing, and giving up of these three feelings.”