2) From the Brothers of the Israelites

Abraham had two sons, Ishmael and Isaac (genesis 21).  Ishmael became the grandfather of the Arab nation, and Isaac became the grandfather of the Jewish nation. 

The prophet spoken of was not to come from among the Jews themselves, but from among their brothers, i.e. The Ishmaelite.  Muhammad [pbuh], a descendant of Ishmael, is indeed this prophet.

Also, Isaiah 42:1-13 speaks of the servant of god, his “chosen one” and “messenger” who will bring down a law.  

“He will not falter or be discouraged till he establishes justice on earth.  In his law the islands will put their hope.” (Isaiah 42:4). 

 Verse 11 connects that awaited one with the descendants of kedar.  Who is Kedar?  According to genesis 25:13, Kedar was the second son of Ishmael, the ancestor of the prophet Muhammad [pbuh].