Sahih Muslim | Book 1 | Hadith Number 98
Narrated by Tamim ad-Dari
It is narrated on the authority of Tamim ad-Dari that the Apostle of Allah (may peace and blessings be upon him) observed: Al-Din is a name of sincerity and well wishing. Upon this we said: For whom? He replied: For Allah, His Book, His Messenger and for the leaders and the general Muslims.