Book of Jasher Chapter 56

62. And Chushim the son of Dan, the son of Jacob, was at that time with Jacob's sons, but
he was about a hundred cubits distant from the place of battle, for he remained with the
children of Jacob's sons by Jacob's bier to guard it.
63. And Chushim was dumb and deaf, still he understood the voice of consternation
amongst men.
64. And he asked, saying, Why do you not bury the dead, and what is this great
consternation? and they answered him the words of Esau and his sons; and he ran to
Esau in the midst of the battle, and he slew Esau with a sword, and he cut off his head,
and it sprang to a distance, and Esau fell amongst the people of the battle.