Vāseṭṭhasutta
Ekaṁ samayaṁ bhagavā vesāliyaṁ viharati mahāvane kūṭāgārasālāyaṁ. Atha kho vāseṭṭho upāsako yena bhagavā tenupasaṅkami; upasaṅkamitvā bhagavantaṁ abhivādetvā ekamantaṁ nisīdi. Ekamantaṁ nisinnaṁ kho vāseṭṭhaṁ upāsakaṁ bhagavā etadavoca: “aṭṭhaṅgasamannāgato, vāseṭṭha, uposatho upavuttho mahapphalo hoti …pe… aninditā saggamupenti ṭhānan”ti.
With Vāseṭṭha on the Sabbath
At one time the Buddha was staying near Vesālī, at the Great Wood, in the hall with the peaked roof. Then the layman Vāseṭṭha went up to the Buddha, bowed, and sat down to one side. The Buddha said to him: “Vāseṭṭha, the observance of the sabbath with its eight factors is very fruitful and beneficial and brilliant and bountiful … blameless, they go to a heavenly place.”