Majjhima Nikaya 4:34
SUJATO‘ahosiṁ nu kho ahaṁ atītamaddhānaṁ? Na nu kho ahosiṁ atītamaddhānaṁ? Kiṁ nu kho ahosiṁ atītamaddhānaṁ? Kathaṁ nu kho ahosiṁ atītamaddhānaṁ? Kiṁ hutvā kiṁ ahosiṁ nu kho ahaṁ atītamaddhānaṁ?
‘Did I exist in the past? Did I not exist in the past? What was I in the past? How was I in the past? After being what, what did I become in the past?