To Muawiya bin Abi Sufian
I have received from you the packet of unconnected advices and embellished letter. You have written it because of your misguidance, and despatched it because of lack of wisdom. This is the letter of a man who has neither light to show him the way nor leader to guide him on the right path. Passion prompted him and he responded to it. Misguidance led him and he followed it. Consequently he began to speak nonsense and got recklessly astray.
A part of the same letter. Because allegiance is once for all. It is not open to review nor is there any scope for fresh proceedings of election. He who remains out of it is deemed to be critical of Islam while he who reflects upon it is a hypocrite.