The Tipiṭaka in Three Languages

Hetudukamicchattattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 686

[686] A phenomenon (dhamma) that is a root (hetu) and fixed in rightness (sammattaniyata) is a condition, by root condition (hetu-paccaya), for a phenomenon that is a root and fixed in rightness: three.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places