Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tabarani:172ʿUbayd b. Ghannām > Abū Bakr b. Abū Shaybah

[Machine] Ali was killed in the year forty, and his caliphate lasted for five years and six months.  

الطبراني:١٧٢حَدَّثَنَا عُبَيْدُ بْنُ غَنَّامٍ حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ قَالَ

«قُتِلَ عَلِيٌّ سَنَةَ أَرْبَعِينَ وَكَانَتْ خِلَافَتُهُ خَمْسَ سِنِينَ وَسِتَّةَ أَشْهُرٍ»