觀無量壽佛經義疏 2.21

2.21

「時目犍連如鷹隼飛疾至王所，日日如是授王八戒。」目連知已，應機往赴。如鷹隼飛，喻神足之疾。隼音荀，《字書》云「鷙鳥，謂猛鳥也。」八關齊戒唯局一日一夜，故逐日別受，即多宗所計。若準《成論》，延促不拘。三、佛遣富那說法。

"Then Maudgalyāyana, flying like a hawk or falcon, swiftly arrived at the king's place; day after day he conferred the eight precepts upon the king in this manner." When Maudgalyāyana knew of it, he went to attend to the capacity. "Flying like a hawk or falcon" is a metaphor for the speed of his supernormal bases. "Sun" is pronounced *xun*; the dictionary says: "A bird of prey, meaning a fierce bird." The eightfold fast-precepts are limited to one day and one night, so they are received separately day by day; this is the opinion of the Sarvāstivāda school. According to the Chengshi lun, their duration is not restricted. Third, the Buddha sends Pūrṇa to preach the Dharma.