Ud 8:2 Unbinding (2) (Nibbāna Sutta)
I have heard that on one occasion the Blessed One was staying near Sāvatthī at Jeta’s Grove, Anāthapiṇḍika’s monastery. And on that occasion the Blessed One was instructing, urging, rousing, & encouraging the monks with Dhamma-talk concerned with unbinding. The monks–receptive, attentive, focusing their entire awareness, lending ear–listened to the Dhamma.
Then, on realizing the significance of that, the Blessed One on that occasion exclaimed:
It’s hard to see the unaffected,
for the truth is not easily seen.
Craving is pierced
in one who knows;
For one who sees,
there is nothing.