When he learned that the Umayyads blamed him for killing Uthman

When Amīr al-mu’minin learnt that the Umayyads blamed him for killing ‘Uthmān, he said:

Umayyads’s knowledge about me did not desist them from accusing me, nor did my precedence (in accepting Islam) kept off these ignorant people from blaming me. Allāh’s admonitions are more eloquent than my tongue. I am the contester against those who break away from Faith and the opponent of those who entertain doubts. Uncertainties should be placed before Qur’ān, the Book of Allāh (for clarification). Certainly, people will be recompensed according to what they have in their hearts.