Buddha’s teaching to His last disciple, Subhadda, according to the DN16, Mahāparinibbāna Sutta:
The Buddha said this:
Bhagavā etadavoca:
“Subhadda, in whatever teaching and training the noble eightfold path is not found, there is no true ascetic found, no second ascetic, no third ascetic, and no fourth ascetic.
“Yasmiṁ kho, subhadda, dhammavinaye ariyo aṭṭhaṅgiko maggo na upalabbhati, samaṇopi tattha na upalabbhati. Dutiyopi tattha samaṇo na upalabbhati. Tatiyopi tattha samaṇo na upalabbhati. Catutthopi tattha samaṇo na upalabbhati.
In whatever teaching and training the noble eightfold path is found, there is a true ascetic found, a second ascetic, a third ascetic, and a fourth ascetic.
Yasmiñca kho, subhadda, dhammavinaye ariyo aṭṭhaṅgiko maggo upalabbhati, samaṇopi tattha upalabbhati, dutiyopi tattha samaṇo upalabbhati, tatiyopi tattha samaṇo upalabbhati, catutthopi tattha samaṇo upalabbhati. Variant: ca → idheva (mr)