Upon Awakening (Ud 1.1)

Thus have I heard — at one time, the Blessed One was dwelling in Uruvelā on the bank of the river Nerañjarā at the root of the Bodhi tree, having just attained full awakening.

Then, for seven days, the Blessed One sat in one posture experiencing the bliss of liberation. At the end of those seven days, the Blessed One, emerging from that stillness of mind, during the first watch of the night, thoroughly paid attention to dependent origination in forward order:

"This being, that becomes; from the arising of this, that arises. That is: from ignorance as a condition, formations arise; from formations as a condition, consciousness arises; from consciousness as a condition, name-and-form arises; from name-and-form as a condition, the six sense bases arise; from the six sense bases as a condition, contact arises; from contact as a condition, feeling arises; from feeling as a condition, craving arises; from craving as a condition, clinging arises; from clinging as a condition, continued existence comes to be; from continued existence as a condition, birth comes to be; from birth as a condition, aging and death, sorrow, lamentation, pain, displeasure, and despair come to be. Thus is the arising of this whole mass of suffering."

Knowing this, the Blessed One at that time expressed this inspired utterance:

"When phenomena become evident,

To the Brahmin meditating with continuous effort;

All his doubts are dispelled,

When he knows a phenomena with its cause."

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Related Teachings:

The Stableness of the Dhamma (SN 12.20) - The Buddha is sharing the uncertainty of a Buddha having arisen and his teaching shining in the world. While dependent origination would continue regardless, in such a case, beings would not be able to able to attain enlightenment and continue wandering on in samsāra.

Proximate Causes | Links of Dependent Origination (SN 12.23) - This teaching outlines the sequential progression of spiritual development, starting from ignorance and leading to the ultimate knowledge of cessation, emphasizing the causal relationships between factors like faith, joy, and concentration, leading to enlightenment.