Nikaṭṭhasutta
“Cattārome, bhikkhave, puggalā santo saṁvijjamānā lokasmiṁ. Katame cattāro? Nikaṭṭhakāyo anikaṭṭhacitto, anikaṭṭhakāyo nikaṭṭhacitto, anikaṭṭhakāyo ca anikaṭṭhacitto ca, nikaṭṭhakāyo ca nikaṭṭhacitto ca.
Retreat
“Mendicants, these four individuals are found in the world. What four? One is on retreat in body, but not mind; one is on retreat in mind, but not body; one is on retreat in neither body nor mind; and one is on retreat in both body and mind.