The Tipiṭaka in Three Languages

Hetudukaajjhattattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 835

[835] An external phenomenon that is a root (hetu) is a condition for an external phenomenon that is a root by object condition (ārammaṇa-paccaya): nine.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places