Many people falsely assume that the first part of Isaiah chapter 49 is about Jesus.  They believe this because Isaiah talks allot about Jesus and chapter 49 says that this person's mouth is like a sharpened sword, which sounds similar to Revelation 1:16 which describes Jesus' mouth as having a double-edged sword.  But notice that Isaiah 49 also describes this person as a polished arrow and we know that the person with a bow in Revelation 6:2 is not Jesus, so we cannot use the sword alone to identify who this person is or we would also need to explain the arrow.  Also, in Acts 13:46-47 Paul quoted from Isaiah 49 and applied it to himself as a reference to himself!  If Paul says that the first part of Isaiah 49 is about himself then it is obviously not about Jesus.  Furthermore, Isaiah 49 says that this person will be a "light for the Gentiles" and Jesus did not minister to Gentiles while He was here in the flesh, like Paul did.  So the first part of Isaiah 49 is clearly not about Jesus but instead it is about a prophet, and I believe that it is about a contemporary prophet to the Gentiles, in the same way that Paul was a prophet to the Gentiles.