Saṃyuktāgama 170. [Discourse on Views about Nirvāṇa Here and Now]
Thus have I heard. At one time the Buddha was staying at Sāvatthī in Jeta's Grove, Anāthapiṇḍika's Park.
At that time the Blessed One said to the monks: “The existence of what is the cause, by clinging to what, by being fettered and attached to what, by seeing what as the self, do living beings have a view like this and speak like this: 'If one does not enjoy the five sense pleasures, then that is Nirvāṇa here and now; if separated from evil and unwholesome states, with [directed] awareness and [sustained] contemplation, and with joy and happiness born of seclusion, one enters the first absorption … up to … the fourth absorption, then that is the supreme destination of Nirvāṇa?”
The monks said to the Buddha: “The Blessed One is the root of the Dharma, the eye of the Dharma, the foundation of the Dharma …” to be recited fully in the same way in the sequence of the above three discourses.