The Tipiṭaka in Three Languages

Hetudukkusalattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 40

[40] An unwholesome phenomenon (dhamma) that is not a root is a condition for an unwholesome phenomenon that is not a root by faculty condition (indriya-paccaya): three [ways].

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places