Exalted Utterances - Udāna (KN 3)

1: Bodhivaggo - 5
1.3 The Third Discourse about the Awakening (Tree)
Thus I heard: at one time the Gracious One was dwelling near Uruvelā,
on the bank of the river Nerañjarā, at the root of the Awakening tree,
in the first (period) after attaining Awakening. Then at that time the
Gracious One was sitting in one cross-legged posture for seven days
experiencing the happiness of freedom.
Then with the passing of those seven days, the Gracious One, after
arising from that concentration, for the last watch of the night, applied
his mind thoroughly to conditional origination in forward and reverse
order:
“This being so, that is; from the arising of this, that arises,
this not being so, that is not; from the ceasing of this, that ceases,
that is to say: with ignorance as condition there are (volitional)
processes,
with (volitional) processes as condition: consciousness,
with consciousness as condition: mind and bodily form,
with mind and bodily form as condition: the six sense spheres,
with the six sense spheres as condition: contact,
with contact as condition: feeling,
with feeling as condition: craving,
with craving as condition: attachment,
with attachment as condition: continuation,
with continuation as condition: birth,
with birth as condition: old age, death,