[Machine] Omar ibn al-Khattab wrote to us, "I have appointed Ammar ibn Yasir as a leader and Abdullah ibn Mas'ud as a teacher and minister to you. They are both from the elite companions of Muhammad ﷺ and among the people of Badr. Listen to them and know that I have appointed Ibn Mas'ud in charge of your treasury. So, listen to them, learn from them, and follow their example. I have preferred Abdullah over myself." This narration is authentic according to the conditions set by both Al-Bukhari and Muslim.  

كَتَبَ إِلَيْنَا عُمَرُ بْنُ الْخَطَّابِ «إِنِّي قَدْ بَعَثْتُ إِلَيْكُمْ عَمَّارَ بْنَ يَاسِرٍ أَمِيرًا وَعَبْدَ اللَّهِ بْنَ مَسْعُودٍ مُعَلِّمًا وَوَزِيرًا وَهُمَا مِنَ النُجَبَاءِ مِنْ أَصْحَابِ مُحَمَّدٍ ﷺ مِنْ أَهْلِ بَدْرٍ فَاسْمَعُوا وَقَدْ جَعَلْتُ ابْنَ مَسْعُودٍ عَلَى بَيْتِ مَالِكُمْ فَاسْمَعُوا فَتَعَلَّمُوا مِنْهُمَا وَاقْتَدُوا بِهِمَا وَقَدْ آثَرْتُكْمْ بِعَبْدِ اللَّهِ عَلَى نَفْسِي» صَحِيحٌ عَلَى شَرْطِ الشَّيْخَيْنِ وَلَمْ يُخَرِّجَاهُ على شرط البخاري ومسلم  

[Machine] Umar wrote to the people of Kufa, "Indeed, I have appointed Ammar as a leader and Abdullah ibn Mas'ood as a teacher and minister, and they are from the noble companions of Muhammad, from the people of Badr and Uhud. So follow their example and listen to their words. I have preferred Abdullah over myself for you."  

كَتَبَ عُمَرُ إِلَى أَهْلِ الْكُوفَةِ «إِنِّي قَدْ بَعَثْتُ عَمَّارًا أَمِيرًا وَعَبْدَ اللهِ بْنَ مَسْعُودٍ مُعَلِّمًا وَوَزِيرًا وَهُمَا مِنَ النُّجَبَاءِ مِنْ أَصْحَابِ مُحَمَّدٍ ﷺ مِنْ أَهْلِ بَدْرٍ وَأُحُدٍ فَاقْتَدُوا بِهِمَا وَاسْمَعُوا مِنْ قَوْلِهُمَا وَقَدْ آثَرْتُكُمْ بِعَبْدِ اللهِ عَلَى نَفْسِي»