The Tipiṭaka in Three Languages

Hetudukahīnattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 658

[658] A superior (paṇīta) phenomenon (dhamma) that is a root (hetu) is a condition for a superior phenomenon that is a root 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.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