[Machine] Because the sons of Sahm were supporters of the sons of 'Adi in the pre-Islamic era, and the sons of Jumah gathered against the sons of 'Adi for revenge between them. Then a group of brothers from Jumah stood against them and said, "Indeed, 'Adi is fewer in number than you. If you wish, send their numbers from among you to them, and we will remain as a barrier between you and them. And if you wish, we will help them from us until they become like you." This was said by Az-Zubayr ibn Bakkar. As for Abu 'Ubaidah, he is 'Amir ibn 'Abdullah ibn Al-Jarrah ibn Hilal ibn Ahyab ibn Dabbah ibn Al-Harith ibn Fehr ibn Malik. This was narrated by Muhammad ibn Ishaq and others.  

لِأَنَّ بَنِي سَهْمٍ كَانُوا مُظَاهِرِينَ لِبَنِي عَدِيٍّ فِي الْجَاهِلِيَّةِ وَاجْتَمَعَتْ بَنُو جُمَحٍ عَلَى بَنِي عَدِيٍّ لِنَاثِرَةٍ بَيْنَهُمْ فَقَامَتْ دُونَهُمْ سَهْمٌ إِخْوَةُ جُمَحٍ فَقَالُوا إِنَّ عَدِيًّا أَقَلُّ مِنْكُمْ عَدَدًا فَإِنْ شِئْتُمْ فَأَخْرِجُوا إِلَيْهِمْ أَعْدَادَهُمْ مِنْكُمْ وَنُخَلِّي بَيْنَكُمْ وَبَيْنَهُمْ وَإِنْ شِئْتُمْ وَفَّيْنَاهُمْ مِنَّا حَتَّى يَكُونُوا مِثْلَكُمْ فَتَحَاجَزُوا قَالَهُ الزُّبَيْرُ بْنُ بَكَّارٍ وَأَمَّا أَبُو عُبَيْدَةَ فَإِنَّهُ عَامِرُ بْنُ عَبْدِ اللهِ بْنِ الْجَرَّاحِ بْنِ هِلَالِ بْنِ أَهْيَبَ بْنِ ضَبَّةَ بْنِ الْحَارِثِ بْنِ فِهْرِ بْنِ مَالِكٍ قَالَهُ مُحَمَّدُ بْنُ إِسْحَاقَ وَغَيْرُهُ