حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَنْبَأَنَا ابْنُ عُيَيْنَةَ عَنْ مُحَمَّدِ بْنِ سُوقَةَ عَنْ مُنْذِرٍ الثَّوْرِيِّ عَنْ مُحَمَّدِ بْنِ عَلِيٍّ قَالَ جَاءَ إِلَى عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ نَاسٌ مِنْ النَّاسِ فَشَكَوْا سُعَاةَ عُثْمَانَ قَالَ فَقَالَ لِي أَبِي اذْهَبْ بِهَذَا الْكِتَابِ إِلَى عُثْمَانَ فَقُلْ لَهُ إِنَّ النَّاسَ قَدْ شَكَوْا سُعَاتَكَ وَهَذَا أَمْرُ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي الصَّدَقَةِ فَمُرْهُمْ فَلْيَأْخُذُوا بِهِ قَالَ فَأَتَيْتُ عُثْمَانَ فَذَكَرْتُ ذَلِكَ لَهُ قَالَ فَلَوْ كَانَ ذَاكِرًا عُثْمَانَ بِشَيْءٍ لَذَكَرَهُ يَوْمَئِذٍ يَعْنِي بِسُوءٍ
مسند امام احمد بن حنبل · Hadith 1196
It was narrated that Muhammad bin 'Ali said: Some people came to 'Ali (RA) and complained about ' Uthman' s tax collector. My father said to me: Take this letter to 'Uthman and tell him: The people are complaining about your tax collector, and this is the instruction of the Messenger of Allah (PBUH) 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.
Sanad
حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَنْبَأَنَا ابْنُ عُيَيْنَةَ عَنْ مُحَمَّدِ بْنِ سُوقَةَ عَنْ مُنْذِرٍ الثَّوْرِيِّ عَنْ مُحَمَّدِ بْنِ عَلِيٍّ قَالَ جَاءَ إِلَى عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ