Matthew only for the Jews?

In Matthew Jesus said that He only came for the Jews. Based on this some say that the whole gospel of Matthew is only for the Jews. Is that biblical?

But He answered and said, “I was not sent except to the lost sheep of the house of Israel.”

Matthew 15:24

 

But Jesus said to her, “Let the children be filled first, for it is not good to take the children’s bread and throw it to the little dogs.”

Mark 7:27

 

'For the Son of Man has come to save that which was lost.' Matthew 18:11