說無垢稱經疏 3.313

3.313

贊曰：自下第三，令得勝位。不退轉者，令至十住第七住中位不退也，永更不退作二乘故。《五戒優婆塞戒經》舍利子修大乘道六十劫已，因施眼故，退作二乘。所以《法華經》名化退菩提心聲聞令至不退，故知至於第七住也。非信不退，久已信故。亦非證行二種不退，名初學故。

Commentary: From here below is the third, causing them to attain an exalted stage. As for 'non-retrogression,' it causes them to reach the non-retrogression of stage in the seventh of the ten abodes, never again falling back to become the two vehicles. In the Five Precepts Upāsaka-śīla Sūtra, Śāriputra, having cultivated the Mahāyāna path for sixty aeons, fell back to become the two vehicles because of giving away his eye. Therefore, the Lotus Sūtra speaks of transforming the śrāvakas who had fallen back from the bodhi-mind to make them reach non-retrogression; thus we know they reached the seventh abode. It was not non-retrogression of faith, because they had had faith for a long time. Nor was it the two kinds of non-retrogression of realization and practice, because they were called beginners.