References – DN 14: The Great Discourse on Traces Left Behind 
Sutta / Dīgha Nikāya / DN 14: Mahāpadānasutta

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The story of the Bodhisattva seeing the old person, the sick person, and the dead person isn’t in the scriptures. Teaching by Ajahn Pasanno. [Buddha/Biography ] [Tipiṭaka] [Stories] // [Jātaka Tales] [Postulants]

Sutta: DN 14.2 ascribes this story to the previous Buddha Vipassī. [Previous Buddhas]

Sutta: Snp 3.1 describes the Bodhisattva’s going forth.

Devotion and Ritual: Becoming the Buddha [2017], Session 1, Excerpt 10