Vesālīsutta
Evaṁ me sutaṁ— ekaṁ samayaṁ bhagavā vesāliyaṁ viharati mahāvane kūṭāgārasālāyaṁ. Tena kho pana samayena bhagavā bhikkhūnaṁ anekapariyāyena asubhakathaṁ katheti, asubhāya vaṇṇaṁ bhāsati, asubhabhāvanāya vaṇṇaṁ bhāsati.
At Vesālī
So I have heard. At one time the Buddha was staying near Vesālī, at the Great Wood, in the hall with the peaked roof. Now at that time the Buddha spoke in many ways to the mendicants about the meditation on ugliness. He praised the meditation on ugliness and its development.