Ud 3:1 Kamma (Kamma 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 a certain monk was sitting not far from the Blessed One, his legs crossed, his body held erect, enduring fierce pains, sharp & severe, that were the result of old kamma–mindful, alert, without suffering. The Blessed One saw him sitting not far away, his legs crossed, his body held erect, enduring fierce pains, sharp & severe, that were the result of old kamma–mindful, alert, and not struck down by them.
Then, on realizing the significance of that, the Blessed One on that occasion exclaimed:
For the monk who has left
shaking off the dust of the past,
There’s no point in telling
1. Such (tādin): An adjective applied to the mind of one who has attained the goal. It indicates that the mind “is what it is”–indescribable but not subject to change or alteration.