Pasadikasutta 24.13

24.13

Puna caparaṃ, cunda, bhikkhu sukhassa ca pahānā dukkhassa ca pahānā …pe… catutthaṃ jhānaṃ upasampajja viharati.

Furthermore, with the giving up of pleasure and pain and the disappearance of former happiness and sadness, a mendicant enters and remains in the fourth absorption. It is without pleasure or pain, with pure equanimity and mindfulness.