Dvayatānupassanāsutta
Evaṁ me sutaṁ— ekaṁ samayaṁ bhagavā sāvatthiyaṁ viharati pubbārāme migāramātupāsāde. Tena kho pana samayena bhagavā tadahuposathe pannarase puṇṇāya puṇṇamāya rattiyā bhikkhusaṅghaparivuto abbhokāse nisinno hoti. Atha kho bhagavā tuṇhībhūtaṁ tuṇhībhūtaṁ bhikkhusaṅghaṁ anuviloketvā bhikkhū āmantesi:
Contemplating Pairs
So I have heard. At one time the Buddha was staying near Sāvatthī in the stilt longhouse of Migāra’s mother in the Eastern Monastery. Now, at that time it was the sabbath—the full moon on the fifteenth day—and the Buddha was sitting in the open surrounded by the Saṅgha of monks. Then the Buddha looked around the Saṅgha of monks, who were so very silent. He addressed them: