Mahanidanasutta 28.9

28.9

Yasmiṃ, ānanda, samaye dukkhaṃ vedanaṃ vedeti, neva tasmiṃ samaye sukhaṃ vedanaṃ vedeti, na adukkhamasukhaṃ vedanaṃ vedeti;

At a time when you feel a painful feeling, you don’t feel a pleasant or neutral feeling;