This was laid down in Sāvatthi:
“I will teach you, oh Bhikkhus, what is recluse-ship and what is the purpose 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, is the purpose of recluse-ship? It is the destruction of craving, the destruction of ill-will and the destruction of delusion. This, oh Bhikkhus, is the purpose of recluse-ship.”