Trường Bộ Kinh (Digha Nikaya) 1:641
SUJATOSabbaso rūpasaññānaṁ samatikkamā paṭighasaññānaṁ atthaṅgamā nānattasaññānaṁ amanasikārā ‘ananto ākāso’ti ākāsānañcāyatanaṁ upasampajja viharati,
Going totally beyond perceptions of form, with the disappearance of perceptions of impingement, not focusing on perceptions of diversity, aware that ‘space is infinite’, they enter and remain in the dimension of infinite space.