It is narrated on the authority of Tamim ad-Dari that the Messenger 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.
Muhammad b. Hatim and others narrate the same hadith of the Apostle (may peace and blessings be upon him) on the authority of Tamim ad-Dari.
Umayya b. Bistam narrates the same hadith of the Messenger of Allah (may peace and blessings be upon him) on the authority of Tamim ad-Dari.
It is narrated on the authority of Jarir that he observed I gave pledge of allegiance to the Messenger of Allah (may peace and blessings be upon him) on the observance of prayer, payment of Zakat, and sincerity and well-wishing for every Muslim.
Sufyan narrated on the authority of Ziyad b. 'Ilaqa that he heard Jarir b. 'Abdullah saying
I pledged allegiance to the Messenger of Allah may peace and blessings be upon him) on sincerity and well-wishing for every Muslim.
It is narrated on the authority of Jarir that he observed
I owed allegiance to the Messenger of Allah (may peace and blessings be upon him) on hearing ( is commands) and obeying (them) and the Prophet) instructed me (to act) as lay in my power, and sincerity and goodwill for every Muslim.