The Tipiṭaka in Three Languages

Hetudukavipākattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 152

[152] A phenomenon that is a root (hetu) and has the nature of producing results (vipākadhammadhamma) is a condition for a phenomenon that is a root and has the nature of producing results, by root condition (hetu-paccaya): three.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places