Micchattattika

Abhidhammapiṭaka · Paṭṭhāna (2) · Vol. 41 · Section 1709

[1709] An unfixed phenomenon (aniyato dhammo) is a condition for a phenomenon fixed in rightness (sammattaniyata) by immediacy condition (anantara-paccaya): Change-of-lineage (gotrabhū) is a condition for the path (magga), cleansing (vodāna) is a condition for the path, by immediacy condition.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places

Vol. 41 · Section 1726 — Micchattattika
Vol. 41 · Section 1107 — Ācayagāmittika