The Tipiṭaka in Three Languages

Savitakkadukkusalattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 1681

[1681] An unwholesome phenomenon (dhamma) accompanied by thought is a condition, by root condition (hetu-paccaya), for an unwholesome phenomenon accompanied by thought: three.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places