The most merciful of my ummah upon my ummah is Abu Bakr and the most compassionate of my ummah upon my ummah is ‘Umar
أرحم أمتي بأمتي أبو بكر و أرفق أمتي لأمتي عمر و أصدق أمتي حياء عثمان و أقضى أمتي علي بن أبي طالب
The most merciful of my ummah upon my ummah is Abu Bakr. The most compassionate of my ummah upon my ummah is ‘Umar. The one who possesses the highest level of modesty of my ummah is ‘Uthman. And the best judge of my ummah is ‘Ali ibn Abi Talib.
This hadith is da’if. Although it has many chains, it has been declared mursal and da’if’ by the Huffaz inter alia al Daraqutni, al Hakim, Abu Nuaim, al Asbahani, al Bayhaqi, Ibn ‘Abdul Birr, al Khatib, Ibn Taymiyyah, and Muhammad ibn ‘Abdul Hadi.
Only the following sentence of the narration is thabit (established):
إن لكل أمة أمينا و أميننا أبو عبيدة بن الجراح
Every ummah has a trustworthy individual and our trustworthy man is Abu ‘Ubaidah ibn al Jarrah.
Hafiz Muhammad ibn ‘Abdul Hadi is the only individual to trace all the sources of the hadith and from the contemporary scholars, Mash-hur Hasan Al Salman has done the same in a treatise which has been published. He mentioned this conclusion in his introduction. He also stated that al Albani after reading it agreed that it be taught, as well as his retraction from authenticating the hadith. And Allah knows best.
Although this hadith is in our favour, the Ahl al Sunnah, passion did not blind our eyes from its du’f (weakness). Hence, we do not cite it as proof.
Indeed, Allah subhanahu wa ta ‘ala has made the noble Sahabah radiya Llahu ‘anhum independent by the revelation of numerous verses of the Qur’an and authentic ahadith extolling their virtues, making it meaningless for us to search for wahin and da’if (weak) narrations to prove their merit. At the same time, amazing indeed is the quagmire of the Rawafid who only cite the portion of this hadith which speaks of Sayyidina ‘Ali radiya Llahu ‘anhu. If they declare the hadith da’if, then this portion is also da’if. And if they authenticate it, then what about the rest of the narration which praises the other Sahabah? So take heed, O men of understanding!
 Al Albani: Da’if al Jami’ al Saghir Hadith: 775.
 Al Sahihah Hadith: 1225.