Islamic duty for Muslims 

Every Muslim has a duty before Islam 

He who remembers his Lord and he who does not are like the living and dead. (Bukhari, Muslim).

Allah does not look at your forms and possessions, but He looks at your hearts and your deeds. (Muslim)
 

Prophet Muhammad (Peace be upon him) said: "The noblest charity is that a Muslim acquires some knowledge (of the Deen) then imparts it to a brother Muslim." (Ibn Majah).