Tradition varies respecting the tragic end of Esau. The Book of
Jasher (chap. 56, v. 64) and the Targum of Jonathan (in Vayechi)
both say that Cushim the son of Dan slew Esau at the burial, not
of Isaac, but of Jacob, because he sought to hinder the funeral
obsequies, disputing the title to the sepulchre.
"Oh, that I had wings like a dove! for then I would fly away, and be at
rest" (Ps. lv. 6). This is spoken of Abraham. But why like a dove? Rabbi
Azariah, in the name of Rabbi Yudan, says, "Because all birds when tired
rest on a rock or on a tree, but a dove, when tired of flying, draws in
one wing to rest it, and continues her flight with the other."
THE MIDRASHIM, _Bereshith Rabbah_, chap. 39.