Hidehira died testate requesting the two brothers to serve Yoshitsune as their lord and urged the three to unite as a team against possible attacks by Yoritomo (January 9, 1188 section of "Gyokuyo" [Diary of FUJIWARA no Kanezane]).
義経を主君として給仕し、三人一味の結束をもって、頼朝の攻撃に備えよ、と遺言して没した（『玉葉』文治4年正月9日条）。