大乘起信論義記 3.310

3.310

如是信心成就得發心者，入正定聚，畢竟不退，名住如來種中正因相應。

Those whose faith is perfected in this way and who are able to generate the mind enter the assembly of the definitively fixed, are ultimately non-retrogressing, and are called those who abide in the lineage of the Tathāgatas, conjoined with the correct cause.