大乘起信論略述 1.136

1.136

論。五者名為至不斷故　述曰。此亦事識細分之位。此細事識法執相應無有斷絕。執無斷故名相續識。

Treatise: Fifth is named [the continuing consciousness (pravāha-vijñāna), because... it does not cease].
Commentary: This is also the stage of the subtle aspect of the consciousness of phenomenal objects. This subtle consciousness of phenomenal objects is concorded with attachment to phenomena without interruption; because attachment does not cease, it is called the "continuing consciousness".