With the Hadith - The Sin of Speaking About Allah Without Knowledge
Az-Zuhri narrated from Amr bin Shu'aib from his father from his grandfather who said: The Prophet, peace and blessings be upon him, heard people disputing and said, "Those before you were destroyed by this; they compared parts of the Book of Allah with other parts. The Book of Allah was revealed to confirm each other, so do not deny some parts with others. Say what you know of it, and leave what you do not know to its scholar." Narrated by Ahmad in his Musnad.