The Tipiṭaka in Three Languages

Hetudukaajjhattattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 821

[821] A phenomenon (dhamma) that is a root (hetu) and internal (ajjhatta) is a condition (paccaya) for a phenomenon that is a root and internal by way of 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.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