大方廣佛華嚴經隨疏演義鈔 54.15

54.15

疏「三身轉淨」者，助道能得出世報身名身。初地已上受身非一，後後勝前前，名「生生轉勝」，總由助道福行淨故。

Regarding the Commentary's phrase 'Third, the progressively purified body': the supportive path (sambhāramārga) is able to attain the supramundane retribution-body, which is called 'body.' From the first ground onward, the bodies received are not one; each subsequent one is superior to the preceding one, which is called 'increasingly superior life after life,' entirely due to the purity of the meritorious practices of the supportive path.