Jhānābhiññasutta

sn16.9:3.1 Whenever I want, with the fading away of rapture, I enter and remain in the third absorption, where I meditate with equanimity, mindful and aware, experiencing for themselves the bliss of which the noble ones declare, ‘Equanimous and mindful, one meditates in bliss.’

sn16.9:3.2 And so does Kassapa.