Greek, although there is some evidence which suggests Matthew wrote originally in Aramaic. All trace of this is lost however, and we only have the Greek manuscripts available.
Your question does not make sense. Are you asking which books of the Bible are written about Israel? The word or rather name of Israel started back in the book of Genesis when a man was renamed...
i dont understand your question. But if you mean, is Matthew a book of the Bible, yes, it is the first book of the New Testament. Does this help? If not, sorry!!