Majjhima Nikaya (Coleção dos Discursos Médios) 3:52
SUJATOSanti, bhikkhave, bhikkhū imasmiṁ bhikkhusaṅghe ānāpānassatibhāvanānuyogamanuyuttā viharanti.
In this Saṅgha there are mendicants who are committed to developing the meditation on mindfulness of breathing.