The Tipiṭaka in Three Languages

Hetusahetukadukkusalattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 994

[994] An unwholesome (akusala) phenomenon (dhamma) that is both a root (hetu) and accompanied by a root (sahetuka) is a condition, by root condition (hetu-paccaya), for an unwholesome phenomenon that is both a root and accompanied by a root.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places