The Tipiṭaka in Three Languages

Hetudukaparittattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 556

[556] An exalted (mahaggata) phenomenon (dhamma) that is a root is a condition, by root condition (hetu-paccaya), for an exalted phenomenon that is a root: three.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places