"Kuya-rui" describes that Morouji made a pledge of fideity in this world and the next with Kuya, and "Kuya-rui," "Kojidan" (Talks of the Past), and the like describe that Kuya wrote an official letter to Enma Daio (the King of Hell) when Morouji died.
『空也誄』に空也と二世の契りがあったこと、『空也誄』『古事談』等に、師氏薨去に際して、空也が閻魔大王に送る牒文を書いたと伝えている。