Musannaf Ibn Abi Shaybah

Hazrat Umar bin Zar (may Allah have mercy on him) says that one day I was standing with Imam Sha’bi (may Allah have mercy on him) when a man came to him and asked: What do you say about Hazrat Ali (may Allah be pleased with him) and Hazrat Uthman (may Allah be pleased with him)? Upon this, he (may Allah be pleased with him) replied: I am unconcerned that on the Day of Judgment Hazrat Ali (may Allah be pleased with him) and Hazrat Uthman (may Allah be pleased with him) would complain to me of oppression.