The Greatest Sunnah of The Prophets

Purpose of "La Ilaha Illallah" - Allah is the only Creator and everything else are His creation. Creation cannot do anything without the permission and help of Allah. Allah can do anything and everything without help of creation.
Purpose of "Muhammadur Rasulullah" - Success in this world (before death) and Akhirat (life after death) is ONLY in following the Orders of Allah according to the way shown by Prophet Muhammad Sallallahu Alaihi wa Sallam.
Purpose of Namaz/Salat/Prayer - transfer the complete obedience (of Allah) in Namaz/Salat/Prayer to every action of our lives.
Purpose of Ilm/knowledge - it is Fardh (mandatory) for everyone to learn enough knowledge to be able to recognize Halal (Permissible or Order of Allah) and Haram (Prohibited by Allah).
Purpose of Zikir - to bring the awareness of ever presence (constant/continuous presence) of Allah in our heart.
Purpose of Ikram--e-Muslimin - sacrifice our own needs to fulfill the needs of other Muslims.
Purpose of Ikhlas - everything we do, we do ONLY for the pleasure of Allah. Even if a person reminds us of doing a good action and we do it, we can still do it for Allah ONLY. We should not care what people think and perform good action, even if someone reminds of that good action or does not like that action, this is Ikhlas.
Purpose of Dawat-e-Ilallah/invitation to the Greatness of Allah - since Muhammad Sallallahu Alaihi wa Sallam was the last prophet and no more prophet to come after him, Allah and Muhammad Sallallahu Alaihi wa Sallam gave us the duty of calling everyone (Muslims & nonmuslims) towards the Greatness of Allah.