Trung Bộ Kinh (Majjhima Nikaya) 3:37
SUJATOSanti, bhikkhave, bhikkhū imasmiṁ bhikkhusaṅghe catunnaṁ satipaṭṭhānānaṁ bhāvanānuyogamanuyuttā viharanti—
In this Saṅgha there are mendicants who are committed to developing the four kinds of mindfulness meditation …