He asks about the best book on the matter of the fitnah (trial, discord or temptation) that occurred between 'Ali and Mu'awiyah (may Allah be pleased with them both)?

Question:
May Allah reward you, Honorable Shaykh. This questioner says: What is the best book on the matter of the fitnah (trial, discord or temptation) that occurred between 'Ali and Mu'awiyah (may Allah be pleased with them both)?

Answer:
I do not see that you should read this book, nor do I see that you should be safe from it, nor that you should look into any of these matters, lest something occur in your heart regarding the Companions, or you criticize or approve without evidence, or you have animosity toward some of them or hatred for some of them. I do not see that you should read hadiths or read books on the fitan (trials, discords or temptations). Yes.