This was laid down in Sāvatthi:
“I will teach you, oh Bhikkhus, what is recluse-ship and what are the fruits of recluseship. Therefore listen!
What, oh Bhikkhus, is recluse-ship? It is this very Noble Eightfold Path, which is right view, … pe … right concentration. This is, oh Bhikkhus, what is called recluse-ship.
What, oh Bhikkhus, are the fruits of recluse-ship? These are the fruit of entering the stream, the fruit of one-returning, the fruit of non-returning and the fruit of becoming an arahant. These, oh Bhikkhus, are the fruits of recluse-ship.”