Brahmajalasutta 3.24.6

3.24.6

Yato kho, bho, ayaṃ attā sukhassa ca pahānā dukkhassa ca pahānā pubbeva somanassadomanassānaṃ atthaṅgamā adukkhamasukhaṃ upekkhāsatipārisuddhiṃ catutthaṃ jhānaṃ upasampajja viharati, ettāvatā kho, bho, ayaṃ attā paramadiṭṭhadhammanibbānaṃ patto hotī’ti.

But with the giving up of pleasure and pain and the disappearance of former happiness and sadness, this self enters and remains in the fourth absorption, without pleasure or pain, with pure equanimity and mindfulness. That’s how this self attains ultimate extinguishment in this life.’