Knowing the modern science of the ruler

Al -Hafiz said in the introduction to the book about the reason for his authorship: For when I saw innovation in our time, there was a lot, and people know the Sunnah that I have said, with their reluctance to write news, and the large number of its applicants for neglect and neglect, this invited me to classify a light book that includes the types of hadith science, which he needs, News students, persevered in writing antiquities, and in this behavior of abbreviation, without exile in the multiplication, and God is success