Sahih Muslim Book 39, Hadith Number 6736.

Chapter : There is none to show snore patience than Allah. The Exalted and Glorious, on attributing wrong things to him.

Anas reported this hadith through another chain of transmitters and the words are: “It would be said to him: You have told a lie; what had been demanded from you was quite easier than this (the belief in the Oneness of Allah).”