大般涅槃經集解 2.5

2.5

案僧宗曰：如者，不異之辭，明阿難所傳與佛說不異也。是者，明即是佛說也。有兩物相似亦曰如，故以是字簡相似也。寶亮曰：如斯文理，並是佛說也。智秀曰：阿難所傳，與佛說不異，曰如。言當於理，曰是也。法智曰：阿難自明之辭也。金口所說，旨深意遠，非所仰測。而章句始末，正自如是也。慧朗曰：舊釋云直指之辭也，謂如是之經，我從佛聞，非自造也。

I note that Sengzong says: "'Thus' (ru) is a term meaning 'not different', clarifying that what Ānanda transmits is not different from what the Buddha preached. 'So' (shi) clarifies that it is precisely what the Buddha preached. When two things resemble each other, it is also called ru ('like'); therefore, the word shi ('this/is') is used to distinguish it from mere resemblance." Baoliang says: "Such text and principle are entirely what the Buddha preached." Zhixiu says: "That what Ānanda transmits is not different from what the Buddha preached is called ru ('thus'). That his words accord with principle is called shi ('so')." Fazhi says: "These are words of Ānanda's own clarification. What the Golden Mouth preached has profound purports and far-reaching intent, which cannot be measured by looking up to it. Yet from beginning to end, the words and phrases are precisely just like this." Huilang says: "The older interpretation says it is a term of direct indication, meaning: 'Such a sūtra, I heard from the Buddha; I did not make it up myself.'"