And Moses sent messengers from Kadesh unto the king of Edom, Thus saith thy brother Israel, Thou knowest all the travail that hath befallen us: Sent messengers - unto the king of Edom - Archbishop Usher supposes that the king now reigning in Edom was Hadar, mentioned Genesis 36:39.
Thus saith thy brother Israel - The Edomites were the descendants of Edom or Esau, the brother of Jacob or Israel, from whom the Israelites were descended.