Imam al-Zuhri (may Allah have mercy on him) narrates from Humayd bin Abdul Rahman bin Awf (may Allah have mercy on him), who said: I heard Sayyiduna Mu'awiyah bin Abi Sufyan (may Allah be pleased with him) say: I heard the Messenger of Allah (peace and blessings be upon him) say: "I am only a distributor, and it is Allah who gives."
And I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever Allah intends good for, He grants him understanding of the religion."
And I heard the Messenger of Allah (peace and blessings be upon him) say: "There will always remain a group of this Ummah established upon the command of Allah; those who oppose them will not harm them, until the command of Allah comes while they are prevailing upon the truth."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16804