廣弘明集 9.111

9.111

又文始傳。老子在罽賓彈指。諸天王羅漢五通飛天俱至。遣尹喜為師。得道菩薩為老子作頌。

Also, the Wenshi zhuan says: 'When Laozi snapped his fingers in Jibin, the heavenly kings, arhats, those of the five supernormal knowledges, and flying celestials all arrived together. He dispatched Yin Xi to be their master, and the bodhisattvas who had attained the Dao composed praises for Laozi.'