長阿含經 17.p80

17.p80

“The Tathāgata’s discourses about the past, future, and present are timely, truthful, meaningful, profitable, about Dharma, about discipline, and without any falsehood. From the first night after the Buddha achieved complete awakening to the last night, everything he says in the meantime is true. That’s why he’s called the Tathāgata.