Chief of the Leaders of the Muslims & Amin
Regarding Hazrat Abdur Rahman (ra) bin Auf, the Holy Prophet (sa) once stated, “He is the chief even amongst the leaders of the Muslims.” The Holy Prophet (sa) also stated, “Abdur Rahman (ra) is the amin [trustworthy and faithful] one in the heavens and on the earth.”
(al-Isti‘ab, Vol. 2, p. 846, Abdur Rahman bin Auf, Dar-ul-Jeel, Beirut)