[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