The Tipiṭaka in Three Languages

Cittasaṁpayuttadukkusalattika

Abhidhammapiṭaka · Paṭṭhāna (5) · Vol. 44 · Section 1461

[1461] An indeterminate (abyākata) phenomenon (dhamma) associated with mind (citta-sampayutta) is a condition, by root condition (hetu-paccaya), for an indeterminate phenomenon associated with mind: three.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places