ヴァンギーサ長老が亡き師ニグローダカッパは涅槃に達したのかと仏陀に尋ね、仏陀がそれを確認する『スッタニパータ』小品の経

A sutta of the Cūḷa Vagga in the Suttanipāta in which the elder Vaṅgīsa asks the Buddha whether his late teacher Nigrodhakappa had attained nibbāna, and the Buddha confirms that he had.