1196
Musnad AhmedIt was narrated that Muhammad bin ‘Ali said:
Some people came to "Ali (رضي الله عنه) and complained about "Uthman"s tax collector. My father said to me: take this letter to "Uthman (رضي الله عنه) and tell him: The people are complaining about your tax collector, and this is the instruction of the Messenger of Allah (ﷺ) about collecting zakah, tell them to follow it. So I went to "Uthman and told him about that, He (the narrator) said: If he ["Ali] had wanted to say anything about "Uthman, he would have said it on that occasion - i.e., saying something bad.
Reference: Musnad Ahmad 1196
Arabic/English book : Book 5, Hadith 1196
Arabic/English book : Book 5, Hadith 1196