In the Book of Aggregates - "Haliddakani" it says the following:
"Thus I have heard. On one occasion the Venerable Mahakaccana was dwelling among the people of Avanti on Mount Papata at Kuraraghara. Then the householder Haliddakani approached the Venerable Mahakaccana, paid homage to him, sat down to one side, and said to him: "Venerable Sir, this was said by the Blessed One in 'The Questions of Magandiya' of the Atthakavagga:
'Having left home to roam without abode,
In the village the sage is intimate with none;
Rid of sensual pleasures, without expectations,
He would not engage people in dispute.'"
I'd give you the numbering but I still can't figure that out. I think I'll figure out D.O. before then most likely.
I think its III. 3(3) 1 but that's probably not right.
I'm using Bhikkhu Bodhi's translation.
I ran across similar references earlier and later in SN and I wondered what was being referred to but the Atthakavagga evidently are some of the earliest teachings. I was surprised to see a reference to written material in what I had assumed were Suttas that were passed down verbally.
"To avoid all evil, to cultivate good, and to cleanse one's mind — this is the teaching of the Buddhas" - Dhammapada 183