Taṇhāsutta
“Purimā, bhikkhave, koṭi na paññāyati bhavataṇhāya: ‘ito pubbe bhavataṇhā nāhosi, atha pacchā samabhavī’ti. Evañcetaṁ, bhikkhave, vuccati, atha ca pana paññāyati: ‘idappaccayā bhavataṇhā’ti.
Craving
“Mendicants, it is said that no prior point of craving for continued existence is found, before which there was no craving for continued existence, and afterwards it came to be. And yet it is evident that there is a specific condition for craving for continued existence.