حَدَّثَنَا زَكَرِيَّا بْنُ عَدِيٍّ عَنْ عُبَيْدِ اللَّهِ بْنِ عَمْرٍو عَنْ عَبْدِ اللَّهِ بْنِ مُحَمَّدِ بْنِ عَقِيلٍ قَالَ قُتِلَ عُثْمَانُ رَضِيَ اللَّهُ عَنْهُ سَنَةَ خَمْسٍ وَثَلَاثِينَ فَكَانَتْ الْفِتْنَةُ خَمْسَ سِنِينَ مِنْهَا أَرْبَعَةُ أَشْهُرٍ لِلْحَسَنِ رَضِيَ اللَّهُ عَنْهُ
مسند امام احمد بن حنبل · Hadith 550
It was narrated that 'Abdullah bin Muhammad bin 'Aqeel said: 'Uthman (RA) was killed in 35 AH and the fitnah (turmoil) lasted for five years including four months of al-Hasan's rule.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020