大般涅槃經義記 4.33

4.33

「如我先」下大段第四引說證成，此應引彼《大品經》說證成此義，從上更說入如來藏，至此第一法說教入。

From "As I previously" onward is the fourth major section, citing teachings as corroborating proof; this should cite the teaching of the Pañcaviṃśatisāhasrikā Prajñāpāramitā Sūtra to corroborate this meaning. From the explanation above of entering the tathāgatagarbha up to this point is the first part: teaching entry by means of doctrinal exposition.