Imam Nawawi really choose hadith which became the foundation of the Islamic religion in compiling the book Arba'innya. Antarake-42 in the hadith is the most core is, first Hadith: Hadith intention, that intention depends Practice; Hadith 2: Hadith of Gabriel containing pillars of Islam, Pillars of Iman and Ihsan Pillars; Hadith-6: About Halal, Haram, and doubtful; and Hadith 9: Working appropriate command ability.
There are several reasons that show the importance of the position of the book of al-Arba'in An-Nawawiyah this:
Covers most of affairs and needs of Muslims in the world and in the Hereafter good of the faith, law, sharia, muamalah and morality.
Is a collection of prophetic narrations option, and is jawami'ul kalim which has primacy in the discussion short and dense.
Hadith-hadith is a unity that became scope of Islam, either half or a third or a quarter .
Widely used by scholars to teach Muslims even become the main backrest in providing an understanding of Islam that some scholars concerned with the hadiths and mensyarahnya more detail.