The Messenger of Allah said: The most merciful of my Ummah towards my Ummah is Abu Bakr; the one who adheres most sternly to the religion of Allah is 'Umar; the most sincere of them in shyness and modesty is 'Uthman; the best judge is 'Ali bin Abu Talib; the best in reciting the Book of Allah is Ubayy bin Ka'b; the most knowledgeable of what is lawful and unlawful is Mu'adh bin Jabal; and the most knowledgeable of the rules of inheritance (Fara'id) is Zaid bin Thabit. And every nation has a trustworthy guardian, and the trustworthy guardian of this Ummah is Abu 'Ubaidah bin Jarrah." (Using translation from Ibn Mājah 154)   

قَالَ رَسُولُ اللهِ ﷺ «أَرْحَمُ أُمَّتِي بِأُمَّتِي أَبُو بَكْرٍ وَأَشَدُّهُمْ فِي دِينِ اللهِ عُمَرُ وَأَفْرَضُهُمْ زَيْدٌ وَأَعْلَمُهُمْ بِالْحَلَالِ وَالْحَرَامِ مُعَاذُ بْنُ جَبَلٍ أَلَا وَإِنَّ لِكُلِّ أَمَةٍ أَمِينًا وَأَمِينُ هَذِهِ الْأُمَّةِ أَبُو عُبَيْدَةَ بْنُ الْجَرَّاحِ»  

[Machine] Indeed, you are a young and wise servant. We do not accuse you. You used to write revelations for the Messenger of Allah, so gather them.  

أَرْسَلَ إِلَيَّ أَبُو بَكْرٍ قَالَ إِنَّكَ غُلَامٌ شَابٌّ عَاقِلٌ لَا نَتَّهِمُكَ قَدْ كُنْتَ تَكْتُبُ الْوَحْيَ لِرَسُولِ اللهِ ﷺ فَتَتَّبِعُ الْقُرْآنَ فَاجْمَعْهُ