Trung Bộ Kinh (Majjhima Nikaya) 1:61
SUJATOākāsānañcāyatanaṁ ākāsānañcāyatanato saññatvā ākāsānañcāyatanaṁ maññati, ākāsānañcāyatanasmiṁ maññati, ākāsānañcāyatanato maññati, ākāsānañcāyatanaṁ meti maññati, ākāsānañcāyatanaṁ abhinandati.
Having perceived the dimension of infinite space as the dimension of infinite space, they conceive it to be the dimension of infinite space …