Could you show me where in the Bible those words are found?
You don't know the meaning of "Matt 5:9"?
The books of the Bible have different names. "Matt" means "The Gospel of St. Matthew."
The books are divided into "chapters," and the chapters are divided into "verses." Thus, "5:9" means "chapter five, verse nine."
So "Matt 5:9" means, "Gospel of St. Matthew, chapter five, verse nine."