Feeling
Vedanā Sutta  (SN 38:7)

On one occasion Ven. Sāriputta was staying in Magadha near Nāla Village. Then Jambukhādaka the wanderer went to Ven. Sāriputta and, on arrival, exchanged courteous greetings with him. After an exchange of friendly greetings & courtesies, he sat to one side. As he was sitting there he said to Ven. Sāriputta: “‘Feeling, feeling,’ it is said, my friend Sāriputta. Which feeling (are they referring to)?”

“There are these three feelings: a feeling of pleasure, a feeling of pain, a feeling of neither pleasure nor pain. These are the three feelings.”

“But is there a path, is there a practice for the full comprehension1 of these three feelings?”

“Yes, there is a path, there is a practice for the full comprehension of these three feelings.”

“Then what is the path, what is the practice for the full comprehension of these three feelings?”

“Precisely this noble eightfold path, my friend: right view, right resolve, right speech, right action, right livelihood, right effort, right mindfulness, right concentration. This is the path, this is the practice for the full comprehension of these three feelings.”

“It’s an auspicious path, my friend, an auspicious practice for the full comprehension of these three feelings—enough for the sake of heedfulness.”

See also: SN 36:22