Mathew was written primarily to Jewish people
Mark is written to Romans
Luke is written to the Greek
John is written to the whole world.
Mathew quotes the old testament more than other Gospel writers.
The old testament is alluded to 129 times in Mathew
The kingdom of heaven is used 32 times only by Mathew
That was spoken is used 14timea
That it might be fulfilled 9 times. He constantly draws to old testament prophecies and relating to Messiah.