We relate to you the best narration, in that We revealed to you this Quran, though no doubt, you had no knowledge before. [12:3]
It is narrated on the authority of Aswad b. Hilal that he heard Mu'adh say this: The Messenger of Allah (may peace be upon him) called, me and I replied to him. He (the Holy Prophet) said: Do you know the right of Allah upon the people? and then followed the hadith (mentioned above).