The Tipiṭaka in Three Languages

Hetudukaparittattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 572

[572] A not-root (na-hetu), immeasurable (appamāṇa) phenomenon (dhamma) is a condition for a not-root, immeasurable phenomenon by object condition (ārammaṇa-paccaya): three.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places