Al-Zubayr bin Bakkar narrates: Sayyiduna Uthman al-Ghani (may Allah be pleased with him) was martyred on a Friday, the eighteenth of Dhu al-Hijjah, in the year 36 AH, after Asr. At that time he was eighty-two years old, and on that day he was fasting.
Al-Tabarani recorded it.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 14576
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (101)»