Mahanidanasutta 28.11

28.11

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

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