SHAFAQNA – Imam Sadeq (AS) said: We do not consider a person to be a real and true believer unless he/she is our (Ahlul Bait) devotee and is under our total command. Be aware that we command to our followers the fear of God and piety; therefore adopt these in order that Allah (SWT) grants you mercy. Also with these attributes make our enemies tired in order that God will promote your ranks. Regarding the method of inviting others to Islam, Imam Sadeq (AS) said: Invite people to the path of God and good deeds with ways other than your tongues (with proper Islamic behaviour, same as Ahlul Bait) .
 Osoul Kafi, Vol. 3, Page 124.