Avijjāpaccayasutta

Suttapiṭaka · Saṁyuttanikāya · Nidānavaggasaṁyutta · Vol. 16 · Section 137

[137] He was dwelling at Sāvatthī. … There … "Bhikkhus, with ignorance (avijjā) as condition, volitional formations (saṅkhārā) [come to be]; with volitional formations as condition, consciousness (viññāṇa) … Thus is the origin (samudaya) of this whole mass of suffering (kevalassa dukkhakkhandhassa)."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 16 · Section 88 — Paccayasutta