The Tipiṭaka in Three Languages

Hetudukkusalattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 19

[19] A wholesome phenomenon (dhamma) that is a root (hetu) is a condition for a wholesome phenomenon that is a root by faculty condition (indriya-paccaya): nine.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places